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Alexander KukushkinandGitHub 8cdb0c25d9 Follow up on #2755 (#3137) 
- don't register secondaries with `noloadbalance` tag.
- mention in the documentation that secondaries are also registered in `pg_dist_node`.
- update docker/kubernetes README files to include examples with secondaries being registered in `pg_dist_node`.
2024-08-27 09:34:12 +02:00

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# 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 09:04:35,009 WARNING: Could not activate Linux watchdog device: Can't open watchdog device: [Errno 2] No such file or directory: '/dev/watchdog'
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 WARNING: 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)
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