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README.md
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README.md

ETCD LAB

A distributed, reliable key-value store for the most critical data of a distributed system.
Homepage: https://etcd.io/

Key features:

  • Simple: well-defined, user-facing API (gRPC)
  • Secure: automatic TLS with optional client cert authentication
  • Fast: benchmarked 10,000 writes/sec
  • Reliable: properly distributed using Raft

There are two major use cases: concurrency control in the distributed system and application configuration store. For example, CoreOS Container Linux uses etcd to achieve a global semaphore to avoid that all nodes in the cluster rebooting at the same time. Also, Kubernetes use etcd for their configuration store.

During this lab we will be using etcd3 python client.
Homepage: https://pypi.org/project/etcd3/

Etcd credentials are shared on the slack channel: https://join.slack.com/t/ibm-agh-labs/shared_invite/zt-e8xfjgtd-8IDWmn912qPOflbM1yk6~Q

Please copy & paste them into the cell below:



!pip install etcd3


Requirement already satisfied: etcd3 in /opt/conda/envs/Python36/lib/python3.6/site-packages (0.12.0)
Requirement already satisfied: protobuf>=3.6.1 in /opt/conda/envs/Python36/lib/python3.6/site-packages (from etcd3) (3.6.1)
Requirement already satisfied: grpcio>=1.27.1 in /opt/conda/envs/Python36/lib/python3.6/site-packages (from etcd3) (1.29.0)
Requirement already satisfied: tenacity>=6.1.0 in /opt/conda/envs/Python36/lib/python3.6/site-packages (from etcd3) (6.2.0)
Requirement already satisfied: six>=1.12.0 in /opt/conda/envs/Python36/lib/python3.6/site-packages (from etcd3) (1.12.0)
Requirement already satisfied: setuptools in /opt/conda/envs/Python36/lib/python3.6/site-packages (from protobuf>=3.6.1->etcd3) (40.8.0)



How to connect to etcd using certyficate (part 1: prepare file with certificate)


import base64
import tempfile

etcdHost = etcdCreds["connection"]["grpc"]["hosts"][0]["hostname"]
etcdPort = etcdCreds["connection"]["grpc"]["hosts"][0]["port"]
etcdUser = etcdCreds["connection"]["grpc"]["authentication"]["username"]
etcdPasswd = etcdCreds["connection"]["grpc"]["authentication"]["password"]
etcdCertBase64 = etcdCreds["connection"]["grpc"]["certificate"]["certificate_base64"]
                           
etcdCertDecoded = base64.b64decode(etcdCertBase64)
etcdCertPath = "{}/{}.cert".format(tempfile.gettempdir(), etcdUser)
                           
with open(etcdCertPath, 'wb') as f:
    f.write(etcdCertDecoded)

print(etcdCertPath)


/home/dsxuser/.tmp/ibm_cloud_f59f3a7b_7578_4cf8_ba20_6df3b352ab46.cert



Short Lab description


During the lab we will simulate system that keeps track of logged users


    

  • All users will be stored under parent key (path): /logged_users
    • 

  • Each user will be represented by key value pair

      

    • key /logged_users/name_of_the_user
      • 

    • value hostname of the machine (e.g. name_of_the_user-hostname)
      • 

    

    • 



How to connect to etcd using certyficate (part 2: create client)


import etcd3

etcd = etcd3.client(
    host=etcdHost,
    port=etcdPort,
    user=etcdUser,
    password=etcdPasswd,
    ca_cert=etcdCertPath
)

cfgRoot='/logged_users'


Task 1 : Fetch username and hostname


define two variables


    

  • username name of the logged user (tip: use getpass library)
    • 

  • hostname hostname of your mcomputer (tip: use socket library)
    • 



import getpass
import socket

username = "Uladzislau"  # You can put your name here, while this code is run in the container and user name would be same for all students
hostname = socket.gethostname()

userKey='{}/{}'.format(cfgRoot, username)
userKey, '->', hostname

etcd.put(userKey, hostname)


header {
  cluster_id: 17394822126184162018
  member_id: 17586574424884576738
  revision: 357085
  raft_term: 3204
}



Task 2 : Register number of users


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


for all names in table fixedUsers register the appropriate key value pairs


fixedUsers = [
    'Adam',
    'Borys',
    'Cezary',
    'Damian',
    'Emil',
    'Filip',
    'Gustaw',
    'Henryk',
    'Ignacy',
    'Jacek',
    'Kamil',
    'Leon',
    'Marek',
    'Norbert',
    'Oskar',
    'Patryk',
    'Rafał',
    'Stefan',
    'Tadeusz'
]

for username in fixedUsers:
    userKey='{}/{}'.format(cfgRoot, username)
    etcd.put(userKey, hostname)


Task 3: List all users


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


List all registered user (tip: use common prefix)


for key in etcd.get_prefix(cfgRoot):
    print(key)


(b'/logged_users/Tadeusz - Registered', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-438cad81f4974877a0c254a6d6ff0145-58f95b7948-zfpxd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Borys', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Kamil', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Leon', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Marek', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Norbert', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Cezary', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Damian', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Emil', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Filip', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Gustaw', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Henryk', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Ignacy', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Jacek', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-75760867122b4b86a5bbcd2f5ccc321b-66fd799d96-dc62c', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-a44d382faeed459cb058c7e5432b8e8c-c5c54fd59-bxlrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'testmessage3', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'test_9', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Borys-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Cezary-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Damian-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Emil-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Filip-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Gustaw-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Henryk-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Ignacy-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Jacek-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Kamil-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Leon-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Marek-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Norbert-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Oskar-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Rafa\xc5\x82-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Stefan-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Tadeusz-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'condition failed', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'kochana', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a7823551d9b84fd3b085958036c5f597-d469f8875-ltf7p', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Adamnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Borysnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Cezarynotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Damiannotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Emilnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Filipnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Gustawnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Henryknotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Ignacynotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Jaceknotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Kamilnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7d2ba8>)
(b'Leonnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Mareknotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Norbertnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Oskarnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryknotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Rafa\xc5\x82notebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Stefannotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Tadeusznotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
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(b'Borys', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Cezary', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Damian', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Emil', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Filip', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Gustaw', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Henryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Ignacy', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Jacek', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Kamil', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Leon', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Marek', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Norbert', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Jacek', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Kamil', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Leon', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Marek', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Norbert', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Borys', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Cezary', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Damian', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Emil', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Filip', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Gustaw', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Henryk', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Ignacy', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Borys', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Cezary', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Damian', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Emil', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Filip', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Gustaw', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Henryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Ignacy', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Jacek', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Kamil', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Leon', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Marek', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Norbert', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Adam-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Borys-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Cezary-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Damian-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Emil-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Filip-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Gustaw-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Henryk-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Ignacy-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Jacek-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Kamil-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Leon-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Marek-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Norbert-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Oskar-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Rafa\xc5\x82-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Stefan-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'Tadeusz-host', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz-host', <etcd3.client.KVMetadata object at 0x7f545c8daba8>)
(b'TempUser3-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'TempUser5-hostname3', <etcd3.client.KVMetadata object at 0x7f544a7ec668>)
(b'someValue 2', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)



Task 4 : Same as Task2, but use transaction


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


for all names in table fixedUsers register the appropriate key value pairs, use transaction to make it a single request

(Have you noticed any difference in execution time?)


etcd.transaction(
    compare=[
        etcd.transactions.version(cfgRoot) == 0
    ],
    success=[
        etcd.transactions.put('{}/{}'.format(cfgRoot, user), '{}-hostname'.format(user)) for user in fixedUsers
    ],
    failure=[
        etcd.transactions.put('/tmp/failure', 'condtion failed')
    ]
)


(False, [response_put {
    header {
      revision: 357105
    }
  }])



Task 5 : Get single key (e.g. status of transaction)


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


Check the key you are modifying in on-failure handler in previous task


for i in etcd.get_prefix('/tmp/failure'):
    print(i)


(b'condtion failed', <etcd3.client.KVMetadata object at 0x7f544a7ec6d8>)



Task 6 : Get range of Keys (Emil -> Oskar)


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


    

  • Get range of keys
    • 

  • Is it inclusive / exclusive?
    • 

  • Sort the resposne descending
    • 

  • Sort the resposne descending by value not by key
    • 



for key in etcd.get_range('{}/{}'.format(cfgRoot, 'Emil'), '{}/{}'.format(cfgRoot, 'Oskar'), sort_order='descend', sort_target='value'):
    print(key)


(b'value first', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'testmessage3', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'test_9', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'test', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-condafree1py3690879dede28a40ed88e530f26cab9341-6cpwqdw', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-condafree1py3681d3d2d480474a18b8276572c8600ae7-68hmpxx', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'notebook-cb0ffef2f3e240b4b8a72f0a17ed8bba-d57ff64d8-sj7qq', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'notebook-a7823551d9b84fd3b085958036c5f597-d469f8875-ltf7p', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'kochana', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'condtion failed', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'condition failed', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'condition failed', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Tadeusznotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz_transaction', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Tadeusz-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz-hostname', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Tadeusz-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Tadeusz-hostname', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Tadeusz-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Tadeusz', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefannotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan_transaction', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Stefan-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Stefan', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82notebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82_transaction', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Rafa\xc5\x82-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Rafa\xc5\x82', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Patryknotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk_transaction', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Patryk-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Patryk-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Patryk-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7f10b8>)
(b'Patryk', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskarnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar_transaction', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Oskar-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Oskar', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Norbertnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Norbert_transaction', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Norbert-notebook-condafree1py3621c9aec184684c4586519a69becb7bf2-785r4k8', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Norbert-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Norbert-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Norbert-hostname', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Norbert-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ecd68>)
(b'Norbert-hostname', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Norbert', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
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(b'Borys', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Adamnotebook-66c43e4471114fa295d284b8afdefbb0-58bc66c8d6-9bxrd', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam_transaction', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Adam-notebook-3dd95954209d46018d78a714da459b6a-545894974-srlx9', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Adam-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam-hostname', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Adam-hostname', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7eca58>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f545c8da908>)
(b'Adam', <etcd3.client.KVMetadata object at 0x7f544a7ec588>)



Task 7: Atomic Replace


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


Do it a few times, check if value has been replaced depending on condition


etcd.transaction(
    compare=[],
    success=[
        etcd.transactions.put('{}/{}'.format(cfgRoot, 'Uladzislau'), 'user-{}'.format('Uladzislau'))
    ],
    failure=[]
)

for _ in range(5):
    print(etcd.replace('{}/{}'.format(cfgRoot, 'Uladzislau'), 'user-{}'.format('Uladzislau'), "newUladzislau"))


True
False
False
False
False



Task 8 : Create lease - use it to create expiring key


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


You can create a key that will be for limited time
add user that will expire after a few seconds


Tip: Use lease


import time

etcd.put('{}/{}'.format(cfgRoot, 'TimeLimitedUser'), 'user-{}'.format('TimeLimitedUser'), lease=etcd.lease(ttl=10))

for _ in range(10):
    time.sleep(1)
    print(etcd.get('{}/{}'.format(cfgRoot, 'TimeLimitedUser')))


(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f95c0>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f9668>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f9160>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f95f8>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f9128>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f90f0>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f9588>)
(b'user-TimeLimitedUser', <etcd3.client.KVMetadata object at 0x7f544a7f95c0>)
(None, None)
(None, None)



Task 9 : Create key that will expire after you close the connection to etcd


Tip: use threading library to refresh your lease




Task 10: Use lock to protect section of code


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html




Task 11: Watch key


etcd3 api: https://python-etcd3.readthedocs.io/en/latest/usage.html


This cell will lock this notebook on waiting

After running it create a new notebook and try to add new user