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Update docker-compose demo cluster (#980)

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1. Multi-stage build with an extensive cleanup of useless files and optional image compression
2. Start three-node etcd cluster
3. Start three-node Patroni cluster
4. One container with haproxy
5. All container names are prefixed with "demo-" and don't have suffixes
6. Decommission dev_patroni_cluster.sh script, docker-compose is now standard de-facto.
7. Provide more examples in the docker/README.md
This commit is contained in:
Alexander Kukushkin
2019-03-07 11:32:03 +01:00
committed by GitHub
parent e670122c80
commit f0990532dc
7 changed files with 358 additions and 318 deletions
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docker/README.md
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@@ -1,47 +1,117 @@
# Patroni Dockerfile
You can run Patroni in a docker container using this Dockerfile, or by using one of the Docker image at
https://registry.opensource.zalan.do/v1/repositories/acid/patroni/tags
You can run Patroni in a docker container using this Dockerfile
This Dockerfile is meant in aiding development of Patroni and quick testing of features. It is not a production-worthy
Dockerfile
docker build -t patroni .
# Examples
## Standalone Patroni
docker run -d registry.opensource.zalan.do/acid/patroni:1.0-SNAPSHOT
docker run -d patroni
## Multiple Patroni's communicating with a standalone etcd inside Docker
Basically what you would do would be:
* Run 1 container which provides etcd
docker run -d <IMAGE> --etcd-only
* Run n containers running Patroni, passing the `--etcd` option to the `docker run` command
docker run -d <IMAGE> --etcd=<IP FROM etcd CONTAINER:PORT>
To automate this you can run the following script:
dev_patroni_cluster.sh [OPTIONS]
Options:
--image IMAGE The Docker image to use for the cluster
--members INT The number of members for the cluster
--name NAME The name of the new cluster
## Three-node Patroni cluster with three-node etcd cluster and one haproxy container using docker-compose
Example session:
$ ./dev_patroni_cluster.sh --image registry.opensource.zalan.do/acid/patroni:1.0-SNAPSHOT --members=2 --name=bravo
The etcd container is 6be871a11cb373406ca5ea1c6b39e1.0-SNAPSHOTfdde9fb1d6177212d6ad0c0d1bd9b563, ip=172.17.1.24
Started Patroni container 67e611f2eca7c40f9e6e0e24a4a8f2cba7e3e56d22a420e15ab9240a37a9d7a4, ip=172.17.1.25
Started Patroni container 47dd12ae635ab83b039f5889e250048b606ed5e48e3650b69e365e7e1d4acbcf, ip=172.17.1.26
$ docker-compose up -d
Creating demo-haproxy ...
Creating demo-patroni2 ...
Creating demo-patroni1 ...
Creating demo-patroni3 ...
Creating demo-etcd2 ...
Creating demo-etcd1 ...
Creating demo-etcd3 ...
Creating demo-haproxy
Creating demo-patroni2
Creating demo-patroni1
Creating demo-patroni3
Creating demo-etcd1
Creating demo-etcd2
Creating demo-etcd2 ... done
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
47dd12ae635a registry.opensource.zalan.do/acid/patroni:1.0-SNAPSHOT "/bin/bash /entrypoi 10 seconds ago Up 8 seconds 4001/tcp, 5432/tcp, 2380/tcp bravo_OR64g8bx
67e611f2eca7 registry.opensource.zalan.do/acid/patroni:1.0-SNAPSHOT "/bin/bash /entrypoi 11 seconds ago Up 10 seconds 2380/tcp, 4001/tcp, 5432/tcp bravo_si9no8iz
6be871a11cb3 registry.opensource.zalan.do/acid/patroni:1.0-SNAPSHOT "/bin/bash /entrypoi 12 seconds ago Up 10 seconds 4001/tcp, 5432/tcp, 2380/tcp bravo_etcd
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
5b7a90b4cfbf patroni "/bin/sh /entrypoint…" 29 seconds ago Up 27 seconds demo-etcd2
e30eea5222f2 patroni "/bin/sh /entrypoint…" 29 seconds ago Up 27 seconds demo-etcd1
83bcf3cb208f patroni "/bin/sh /entrypoint…" 29 seconds ago Up 27 seconds demo-etcd3
922532c56e7d patroni "/bin/sh /entrypoint…" 29 seconds ago Up 28 seconds demo-patroni3
14f875e445f3 patroni "/bin/sh /entrypoint…" 29 seconds ago Up 28 seconds demo-patroni2
110d1073b383 patroni "/bin/sh /entrypoint…" 29 seconds ago Up 28 seconds demo-patroni1
5af5e6e36028 patroni "/bin/sh /entrypoint…" 29 seconds ago Up 28 seconds 0.0.0.0:5000-5001->5000-5001/tcp demo-haproxy
$ docker logs demo-patroni1
2019-02-20 08:19:32,714 INFO: Failed to import patroni.dcs.consul
2019-02-20 08:19:32,737 INFO: Selected new etcd server http://etcd3:2379
2019-02-20 08:19:35,140 INFO: Lock owner: None; I am patroni1
2019-02-20 08:19:35,174 INFO: trying to bootstrap a new cluster
...
2019-02-20 08:19:39,310 INFO: postmaster pid=37
2019-02-20 08:19:39.314 UTC [37] LOG: listening on IPv4 address "0.0.0.0", port 5432
2019-02-20 08:19:39.321 UTC [37] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432"
2019-02-20 08:19:39.353 UTC [39] LOG: database system was shut down at 2019-02-20 08:19:36 UTC
2019-02-20 08:19:39.354 UTC [40] FATAL: the database system is starting up
localhost:5432 - rejecting connections
2019-02-20 08:19:39.369 UTC [37] LOG: database system is ready to accept connections
localhost:5432 - accepting connections
2019-02-20 08:19:39,383 INFO: establishing a new patroni connection to the postgres cluster
2019-02-20 08:19:39,408 INFO: running post_bootstrap
2019-02-20 08:19:39,432 WARNING: Could not activate Linux watchdog device: "Can't open watchdog device: [Errno 2] No such file or directory: '/dev/watchdog'"
2019-02-20 08:19:39,515 INFO: initialized a new cluster
2019-02-20 08:19:49,424 INFO: Lock owner: patroni1; I am patroni1
2019-02-20 08:19:49,447 INFO: Lock owner: patroni1; I am patroni1
2019-02-20 08:19:49,480 INFO: no action. i am the leader with the lock
2019-02-20 08:19:59,422 INFO: Lock owner: patroni1; I am patroni1
$ docker exec -ti demo-patroni1 bash
postgres@patroni1:~$ patronictl list
+-------------+----------+------------+--------+---------+----+-----------+
| Cluster | Member | Host | Role | State | TL | Lag in MB |
+-------------+----------+------------+--------+---------+----+-----------+
| testcluster | patroni1 | 172.21.0.3 | Leader | running | 1 | 0 |
| testcluster | patroni2 | 172.21.0.4 | | running | 1 | 0 |
| testcluster | patroni3 | 172.21.0.5 | | running | 1 | 0 |
+-------------+----------+------------+--------+---------+----+-----------+
postgres@patroni1:~$ etcdctl ls --recursive --sort -p /service/testcluster
/service/testcluster/config
/service/testcluster/initialize
/service/testcluster/leader
/service/testcluster/members/
/service/testcluster/members/patroni1
/service/testcluster/members/patroni2
/service/testcluster/members/patroni3
/service/testcluster/optime/
/service/testcluster/optime/leader
postgres@patroni1:~$ etcdctl member list
1bab629f01fa9065: name=etcd3 peerURLs=http://etcd3:2380 clientURLs=http://etcd3:2379 isLeader=false
8ecb6af518d241cc: name=etcd2 peerURLs=http://etcd2:2380 clientURLs=http://etcd2:2379 isLeader=true
b2e169fcb8a34028: name=etcd1 peerURLs=http://etcd1:2380 clientURLs=http://etcd1:2379 isLeader=false
postgres@patroni1:~$ exit
$ psql -h localhost -p 5000 -U postgres -W
Password: postgres
psql (11.2 (Ubuntu 11.2-1.pgdg18.04+1), server 10.7 (Debian 10.7-1.pgdg90+1))
Type "help" for help.
localhost/postgres=# select pg_is_in_recovery();
pg_is_in_recovery
───────────────────
f
(1 row)
localhost/postgres=# \q
$ psql -h localhost -p 5001 -U postgres -W
Password: postgres
psql (11.2 (Ubuntu 11.2-1.pgdg18.04+1), server 10.7 (Debian 10.7-1.pgdg90+1))
Type "help" for help.
localhost/postgres=# select pg_is_in_recovery();
pg_is_in_recovery
───────────────────
t
(1 row)