# Dockerfile and Dockerfile.citus You can run Patroni in a docker container using these Dockerfiles They are meant in aiding development of Patroni and quick testing of features and not a production-worthy! docker build -t patroni . docker build -f Dockerfile.citus -t patroni-citus . # Examples ## Standalone Patroni docker run -d patroni ## Three-node Patroni cluster In addition to three Patroni containers the stack starts three containers with etcd (forming a three-node cluster), and one container with haproxy. The haproxy listens on ports 5000 (connects to the primary) and 5001 (does load-balancing between healthy standbys). Example session: $ docker compose up -d ✔ Network patroni_demo Created ✔ Container demo-etcd1 Started ✔ Container demo-haproxy Started ✔ Container demo-patroni1 Started ✔ Container demo-patroni2 Started ✔ Container demo-patroni3 Started ✔ Container demo-etcd2 Started ✔ Container demo-etcd3 Started $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES a37bcec56726 patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-etcd3 034ab73868a8 patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-patroni2 03837736f710 patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-patroni3 22815c3d85b3 patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-etcd2 814b4304d132 patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes 0.0.0.0:5000-5001->5000-5001/tcp, :::5000-5001->5000-5001/tcp demo-haproxy 6375b0ba2d0a patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-patroni1 aef8bf3ee91f patroni "/bin/sh /entrypoint…" 15 minutes ago Up 15 minutes demo-etcd1 $ docker logs demo-patroni1 2024-08-26 09:04:33,547 INFO: Selected new etcd server http://172.29.0.3:2379 2024-08-26 09:04:33,605 INFO: Lock owner: None; I am patroni1 2024-08-26 09:04:33,693 INFO: trying to bootstrap a new cluster ... 2024-08-26 09:04:34.920 UTC [43] LOG: starting PostgreSQL 16.4 (Debian 16.4-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit 2024-08-26 09:04:34.921 UTC [43] LOG: listening on IPv4 address "0.0.0.0", port 5432 2024-08-26 09:04:34,922 INFO: postmaster pid=43 2024-08-26 09:04:34.922 UTC [43] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2024-08-26 09:04:34.925 UTC [47] LOG: database system was shut down at 2024-08-26 09:04:34 UTC 2024-08-26 09:04:34.928 UTC [43] LOG: database system is ready to accept connections localhost:5432 - accepting connections localhost:5432 - accepting connections 2024-08-26 09:04:34,938 INFO: establishing a new patroni heartbeat connection to postgres 2024-08-26 09:04:34,992 INFO: running post_bootstrap 2024-08-26 09:04:35,004 WARNING: User creation via "bootstrap.users" will be removed in v4.0.0 2024-08-26 09:04:35,189 INFO: initialized a new cluster 2024-08-26 09:04:35,328 INFO: no action. I am (patroni1), the leader with the lock 2024-08-26 09:04:43,824 INFO: establishing a new patroni restapi connection to postgres 2024-08-26 09:04:45,322 INFO: no action. I am (patroni1), the leader with the lock 2024-08-26 09:04:55,320 INFO: no action. I am (patroni1), the leader with the lock ... $ docker exec -ti demo-patroni1 bash postgres@patroni1:~$ patronictl list + Cluster: demo (7303838734793224214) --------+----+-----------+ | Member | Host | Role | State | TL | Lag in MB | +----------+------------+---------+-----------+----+-----------+ | patroni1 | 172.29.0.2 | Leader | running | 1 | | | patroni2 | 172.29.0.6 | Replica | streaming | 1 | 0 | | patroni3 | 172.29.0.5 | Replica | streaming | 1 | 0 | +----------+------------+---------+-----------+----+-----------+ postgres@patroni1:~$ etcdctl get --keys-only --prefix /service/demo /service/demo/config /service/demo/initialize /service/demo/leader /service/demo/members/patroni1 /service/demo/members/patroni2 /service/demo/members/patroni3 /service/demo/status postgres@patroni1:~$ etcdctl member list 2bf3e2ceda5d5960, started, etcd2, http://etcd2:2380, http://172.29.0.3:2379 55b3264e129c7005, started, etcd3, http://etcd3:2380, http://172.29.0.7:2379 acce7233f8ec127e, started, etcd1, http://etcd1:2380, http://172.29.0.8:2379 postgres@patroni1:~$ exit $ docker exec -ti demo-haproxy bash postgres@haproxy:~$ psql -h localhost -p 5000 -U postgres -W Password: postgres psql (16.4 (Debian 16.4-1.pgdg120+1)) Type "help" for help. postgres=# SELECT pg_is_in_recovery(); pg_is_in_recovery ─────────────────── f (1 row) postgres=# \q postgres@haproxy:~$ psql -h localhost -p 5001 -U postgres -W Password: postgres psql (16.4 (Debian 16.4-1.pgdg120+1)) Type "help" for help. postgres=# SELECT pg_is_in_recovery(); pg_is_in_recovery ─────────────────── t (1 row) ## Citus cluster The stack starts three containers with etcd (forming a three-node etcd cluster), seven containers with Patroni+PostgreSQL+Citus (three coordinator nodes, and two worker clusters with two nodes each), and one container with haproxy. The haproxy listens on ports 5000 (connects to the coordinator primary) and 5001 (does load-balancing between worker primary nodes). Example session: $ docker-compose -f docker-compose-citus.yml up -d ✔ Network patroni_demo Created ✔ Container demo-coord2 Started ✔ Container demo-work2-2 Started ✔ Container demo-etcd1 Started ✔ Container demo-haproxy Started ✔ Container demo-work1-1 Started ✔ Container demo-work2-1 Started ✔ Container demo-work1-2 Started ✔ Container demo-coord1 Started ✔ Container demo-etcd3 Started ✔ Container demo-coord3 Started ✔ Container demo-etcd2 Started $ docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 79c95492fac9 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-etcd3 77eb82d0f0c1 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-work2-1 03dacd7267ef patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-etcd1 db9206c66f85 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-etcd2 9a0fef7b7dd4 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-work1-2 f06b031d99dc patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-work2-2 f7c58545f314 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-coord2 383f9e7e188a patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-work1-1 f02e96dcc9d6 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-coord3 6945834b7056 patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes demo-coord1 b96ca42f785d patroni-citus "/bin/sh /entrypoint…" 11 minutes ago Up 11 minutes 0.0.0.0:5000-5001->5000-5001/tcp, :::5000-5001->5000-5001/tcp demo-haproxy $ docker logs demo-coord1 2024-08-26 08:21:05,323 INFO: Selected new etcd server http://172.19.0.5:2379 2024-08-26 08:21:05,339 INFO: No PostgreSQL configuration items changed, nothing to reload. 2024-08-26 08:21:05,388 INFO: Lock owner: None; I am coord1 2024-08-26 08:21:05,480 INFO: trying to bootstrap a new cluster ... 2024-08-26 08:21:17,115 INFO: postmaster pid=35 localhost:5432 - no response 2024-08-26 08:21:17.127 UTC [35] LOG: starting PostgreSQL 16.4 (Debian 16.4-1.pgdg120+1) on x86_64-pc-linux-gnu, compiled by gcc (Debian 12.2.0-14) 12.2.0, 64-bit 2024-08-26 08:21:17.127 UTC [35] LOG: listening on IPv4 address "0.0.0.0", port 5432 2024-08-26 08:21:17.141 UTC [35] LOG: listening on Unix socket "/var/run/postgresql/.s.PGSQL.5432" 2024-08-26 08:21:17.155 UTC [39] LOG: database system was shut down at 2024-08-26 08:21:05 UTC 2024-08-26 08:21:17.182 UTC [35] LOG: database system is ready to accept connections 2024-08-26 08:21:17,683 INFO: establishing a new patroni heartbeat connection to postgres 2024-08-26 08:21:17,704 INFO: establishing a new patroni restapi connection to postgres localhost:5432 - accepting connections localhost:5432 - accepting connections 2024-08-26 08:21:18,202 INFO: running post_bootstrap 2024-08-26 08:21:19.048 UTC [53] LOG: starting maintenance daemon on database 16385 user 10 2024-08-26 08:21:19.048 UTC [53] CONTEXT: Citus maintenance daemon for database 16385 user 10 2024-08-26 08:21:19,058 DEBUG: Could not activate Linux watchdog device: Can't open watchdog device: [Errno 2] No such file or directory: '/dev/watchdog' 2024-08-26 08:21:19.250 UTC [37] LOG: checkpoint starting: immediate force wait 2024-08-26 08:21:19,275 INFO: initialized a new cluster 2024-08-26 08:21:22.946 UTC [37] LOG: checkpoint starting: immediate force wait 2024-08-26 08:21:29,059 INFO: Lock owner: coord1; I am coord1 2024-08-26 08:21:29,205 INFO: Enabled synchronous replication 2024-08-26 08:21:29,206 DEBUG: query(SELECT groupid, nodename, nodeport, noderole, nodeid FROM pg_catalog.pg_dist_node, ()) 2024-08-26 08:21:29,206 INFO: establishing a new patroni citus connection to postgres 2024-08-26 08:21:29,206 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.8,port=5432,role=primary)}) 2024-08-26 08:21:29,206 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.2,port=5432,role=primary)}) 2024-08-26 08:21:29,206 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.9,port=5432,role=primary)}) 2024-08-26 08:21:29,219 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.2', 5432, 1, 'primary')) 2024-08-26 08:21:29,256 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.9', 5432, 2, 'primary')) 2024-08-26 08:21:29,474 INFO: no action. I am (coord1), the leader with the lock 2024-08-26 08:21:39,060 INFO: Lock owner: coord1; I am coord1 2024-08-26 08:21:39,159 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.8,port=5432,role=primary), PgDistNode(nodeid=None,host=172.19.0.11,port=5432,role=secondary), PgDistNode(nodeid=None,host=172.19.0.7,port=5432,role=secondary)}) 2024-08-26 08:21:39,159 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.2,port=5432,role=primary), PgDistNode(nodeid=None,host=172.19.0.12,port=5432,role=secondary)}) 2024-08-26 08:21:39,159 DEBUG: Adding the new task: PgDistTask({PgDistNode(nodeid=None,host=172.19.0.6,port=5432,role=secondary), PgDistNode(nodeid=None,host=172.19.0.9,port=5432,role=primary)}) 2024-08-26 08:21:39,160 DEBUG: query(BEGIN, ()) 2024-08-26 08:21:39,160 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.11', 5432, 0, 'secondary')) 2024-08-26 08:21:39,164 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.7', 5432, 0, 'secondary')) 2024-08-26 08:21:39,166 DEBUG: query(COMMIT, ()) 2024-08-26 08:21:39,176 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.12', 5432, 1, 'secondary')) 2024-08-26 08:21:39,191 DEBUG: query(SELECT pg_catalog.citus_add_node(%s, %s, %s, %s, 'default'), ('172.19.0.6', 5432, 2, 'secondary')) 2024-08-26 08:21:39,211 INFO: no action. I am (coord1), the leader with the lock 2024-08-26 08:21:49,060 INFO: Lock owner: coord1; I am coord1 2024-08-26 08:21:49,166 INFO: Setting synchronous replication to 1 of 2 (coord2, coord3) server signaled 2024-08-26 08:21:49.170 UTC [35] LOG: received SIGHUP, reloading configuration files 2024-08-26 08:21:49.171 UTC [35] LOG: parameter "synchronous_standby_names" changed to "ANY 1 (coord2,coord3)" 2024-08-26 08:21:49.377 UTC [68] LOG: standby "coord2" is now a candidate for quorum synchronous standby 2024-08-26 08:21:49.377 UTC [68] STATEMENT: START_REPLICATION SLOT "coord2" 0/3000000 TIMELINE 1 2024-08-26 08:21:49.377 UTC [69] LOG: standby "coord3" is now a candidate for quorum synchronous standby 2024-08-26 08:21:49.377 UTC [69] STATEMENT: START_REPLICATION SLOT "coord3" 0/4000000 TIMELINE 1 2024-08-26 08:21:50,278 INFO: Setting leader to coord1, quorum to 1 of 2 (coord2, coord3) 2024-08-26 08:21:50,390 INFO: no action. I am (coord1), the leader with the lock 2024-08-26 08:21:59,159 INFO: no action. I am (coord1), the leader with the lock ... $ docker exec -ti demo-haproxy bash postgres@haproxy:~$ etcdctl member list 2b28411e74c0c281, started, etcd3, http://etcd3:2380, http://172.30.0.4:2379 6c70137d27cfa6c1, started, etcd2, http://etcd2:2380, http://172.30.0.5:2379 a28f9a70ebf21304, started, etcd1, http://etcd1:2380, http://172.30.0.6:2379 postgres@haproxy:~$ etcdctl get --keys-only --prefix /service/demo /service/demo/0/config /service/demo/0/initialize /service/demo/0/leader /service/demo/0/members/coord1 /service/demo/0/members/coord2 /service/demo/0/members/coord3 /service/demo/0/status /service/demo/0/sync /service/demo/1/config /service/demo/1/initialize /service/demo/1/leader /service/demo/1/members/work1-1 /service/demo/1/members/work1-2 /service/demo/1/status /service/demo/1/sync /service/demo/2/config /service/demo/2/initialize /service/demo/2/leader /service/demo/2/members/work2-1 /service/demo/2/members/work2-2 /service/demo/2/status /service/demo/2/sync postgres@haproxy:~$ psql -h localhost -p 5000 -U postgres -d citus Password for user postgres: postgres psql (16.4 (Debian 16.4-1.pgdg120+1)) SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, compression: off) Type "help" for help. citus=# select pg_is_in_recovery(); pg_is_in_recovery ------------------- f (1 row) citus=# table pg_dist_node; nodeid | groupid | nodename | nodeport | noderack | hasmetadata | isactive | noderole | nodecluster | metadatasynced | shouldhaveshards --------+---------+-------------+----------+----------+-------------+----------+-----------+-------------+----------------+------------------ 1 | 0 | 172.19.0.8 | 5432 | default | t | t | primary | default | t | f 2 | 1 | 172.19.0.2 | 5432 | default | t | t | primary | default | t | t 3 | 2 | 172.19.0.9 | 5432 | default | t | t | primary | default | t | t 4 | 0 | 172.19.0.11 | 5432 | default | t | t | secondary | default | t | f 5 | 0 | 172.19.0.7 | 5432 | default | t | t | secondary | default | t | f 6 | 1 | 172.19.0.12 | 5432 | default | f | t | secondary | default | f | t 7 | 2 | 172.19.0.6 | 5432 | default | f | t | secondary | default | f | t (7 rows) citus=# \q postgres@haproxy:~$ patronictl list + Citus cluster: demo ----------+----------------+-----------+----+-----------+ | Group | Member | Host | Role | State | TL | Lag in MB | +-------+---------+-------------+----------------+-----------+----+-----------+ | 0 | coord1 | 172.19.0.8 | Leader | running | 1 | | | 0 | coord2 | 172.19.0.7 | Quorum Standby | streaming | 1 | 0 | | 0 | coord3 | 172.19.0.11 | Quorum Standby | streaming | 1 | 0 | | 1 | work1-1 | 172.19.0.12 | Quorum Standby | streaming | 1 | 0 | | 1 | work1-2 | 172.19.0.2 | Leader | running | 1 | | | 2 | work2-1 | 172.19.0.6 | Quorum Standby | streaming | 1 | 0 | | 2 | work2-2 | 172.19.0.9 | Leader | running | 1 | | +-------+---------+-------------+----------------+-----------+----+-----------+ postgres@haproxy:~$ patronictl switchover --group 2 --force Current cluster topology + Citus cluster: demo (group: 2, 7407360296219029527) ---+-----------+ | Member | Host | Role | State | TL | Lag in MB | +---------+------------+----------------+-----------+----+-----------+ | work2-1 | 172.19.0.6 | Quorum Standby | streaming | 1 | 0 | | work2-2 | 172.19.0.9 | Leader | running | 1 | | +---------+------------+----------------+-----------+----+-----------+ 2024-08-26 08:31:45.92277 Successfully switched over to "work2-1" + Citus cluster: demo (group: 2, 7407360296219029527) ------+ | Member | Host | Role | State | TL | Lag in MB | +---------+------------+---------+---------+----+-----------+ | work2-1 | 172.19.0.6 | Leader | running | 1 | | | work2-2 | 172.19.0.9 | Replica | stopped | | unknown | +---------+------------+---------+---------+----+-----------+ postgres@haproxy:~$ patronictl list + Citus cluster: demo ----------+----------------+-----------+----+-----------+ | Group | Member | Host | Role | State | TL | Lag in MB | +-------+---------+-------------+----------------+-----------+----+-----------+ | 0 | coord1 | 172.19.0.8 | Leader | running | 1 | | | 0 | coord2 | 172.19.0.7 | Quorum Standby | streaming | 1 | 0 | | 0 | coord3 | 172.19.0.11 | Quorum Standby | streaming | 1 | 0 | | 1 | work1-1 | 172.19.0.12 | Quorum Standby | streaming | 1 | 0 | | 1 | work1-2 | 172.19.0.2 | Leader | running | 1 | | | 2 | work2-1 | 172.19.0.6 | Leader | running | 2 | | | 2 | work2-2 | 172.19.0.9 | Quorum Standby | streaming | 2 | 0 | +-------+---------+-------------+----------------+-----------+----+-----------+ postgres@haproxy:~$ psql -h localhost -p 5000 -U postgres -d citus Password for user postgres: postgres psql (16.4 (Debian 16.4-1.pgdg120+1)) SSL connection (protocol: TLSv1.3, cipher: TLS_AES_256_GCM_SHA384, compression: off) Type "help" for help. citus=# table pg_dist_node; nodeid | groupid | nodename | nodeport | noderack | hasmetadata | isactive | noderole | nodecluster | metadatasynced | shouldhaveshards --------+---------+-------------+----------+----------+-------------+----------+-----------+-------------+----------------+------------------ 1 | 0 | 172.19.0.8 | 5432 | default | t | t | primary | default | t | f 4 | 0 | 172.19.0.11 | 5432 | default | t | t | secondary | default | t | f 5 | 0 | 172.19.0.7 | 5432 | default | t | t | secondary | default | t | f 6 | 1 | 172.19.0.12 | 5432 | default | f | t | secondary | default | f | t 3 | 2 | 172.19.0.6 | 5432 | default | t | t | primary | default | t | t 2 | 1 | 172.19.0.2 | 5432 | default | t | t | primary | default | t | t 8 | 2 | 172.19.0.9 | 5432 | default | f | t | secondary | default | f | t (7 rows)