Ciao, oggi ti spiego l'installazione di patroni ad alta disponibilità.
1-Installazione software PostgreSQL
2-Installazione software Patroni
3-Installazione software etcd, etcd conf.
4-patroni conf.
5-pgbackrest setup e conf.
6-aproxy e keepalived
7-Tutte le altre conf.
Software PostgreSQL
yum install -y postgresql12-server postgresql12-client postgresql12-contrib postgresql12-devel
Software Patroni
export PATH="$PATH:/usr/pgsql-12/bin" yum install -y python3-pip-9.0.3-5.el7.noarch gcc python3-devel pip3 install --upgrade pip wheel pip3 install psycopg2-binary pip3 install psycopg2>=2.5.4 pip3 install patroni[etcd]
installazione e configurazione etcd
yum install -y etcd
--vi /etc/etcd/etcd.conf ##--pgdb-1 ETCD_INITIAL_CLUSTER="etcd1=http://xxx.xxx.xx.xx:2380,etcd2=http://xxx.xxx.xx.xx:2380" ETCD_INITIAL_CLUSTER_STATE="new" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-01" ETCD_INITIAL_ADVERTISE_PEER_URLS="http://xxx.xxx.xx.xx:2380" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" ETCD_LISTEN_PEER_URLS="http://xxx.xxx.xx.xx:2380" ETCD_LISTEN_CLIENT_URLS="http://xxx.xxx.xx.xx:2379,http://127.0.0.1:2379" ETCD_ADVERTISE_CLIENT_URLS="http://xxx.xxx.xx.xx:2379" ETCD_NAME="etcd1" ##--pgdb-2 ETCD_INITIAL_CLUSTER="etcd1=http://xxx.xxx.xx.xx:2380,etcd2=http://xxx.xxx.xx.xx:2380" ETCD_INITIAL_CLUSTER_STATE="new" ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster-01" ETCD_INITIAL_ADVERTISE_PEER_URLS="http://xxx.xxx.xx.xx:2380" ETCD_DATA_DIR="/var/lib/etcd/default.etcd" ETCD_LISTEN_PEER_URLS="http://xxx.xxx.xx.xx:2380" ETCD_LISTEN_CLIENT_URLS="http://xxx.xxx.xx.xx:2379,http://127.0.0.1:2379" ETCD_ADVERTISE_CLIENT_URLS="http://xxx.xxx.xx.xx:2379" ETCD_NAME="etcd2" systemctl enable etcd systemctl start etcd systemctl status etcd systemctl stop etcd
Conf. Patroni
La directory viene creata per il file patroni yaml. e postgres è autorizzato
mkdir /etc/patroni/ chown postgres:postgres /etc/patroni/ mkdir /postgres/ chown postgres:postgres /postgres/
–// Il file yml deve essere impostato in base agli indirizzi IP e alla memoria del server, ecc. in base alle risorse del server. è necessario effettuare le impostazioni.
scope: pgdb-patroni name: postgres1 restapi: listen: xxx.xxx.xx.xx:8008 connect_address: xxx.xxx.xx.xx:8008 etcd: hosts: 1xxx.xxx.xx.xx:2379,xxx.xxx.xx.xx:2379 bootstrap: dcs: ttl: 30 loop_wait: 10 retry_timeout: 10 maximum_lag_on_failover: 1048576 postgresql: use_pg_rewind: true parameters: wal_level: hot_standby hot_standby: "on" wal_keep_segments: 8 max_wal_senders: 10 max_replication_slots: 10 wal_log_hints: "on" max_connections: 200 shared_buffers: 1GB effective_cache_size: 3GB maintenance_work_mem: 256MB checkpoint_completion_target: 0.7 wal_buffers: 16MB default_statistics_target: 100 random_page_cost: 1.1 effective_io_concurrency: 300 work_mem: 5242kB min_wal_size: 1GB max_wal_size: 4GB max_worker_processes: 2 max_parallel_workers_per_gather: 1 max_parallel_workers: 2 max_parallel_maintenance_workers: 1 archive_mode: "on" archive_timeout: 1800s archive_command: "pgbackrest --stanza=pgdb-patroni archive-push %p" recovery_conf: restore_command: "pgbackrest --stanza=pgdb-patroni archive-get %f %p" standby_mode: "on" initdb: - encoding: UTF8 - data-checksums pg_hba: - host replication replicator xxx.xxx.xx.xx/24 md5 - host all all 0.0.0.0/0 md5 users: admin: password: admin options: - createrole - createdb postgresql: listen: xxx.xxx.xx.xx:5432 connect_address: xxx.xxx.xx.xx:5432 data_dir: /postgres/data/ bin_dir: /usr/pgsql-12/bin pgpass: /tmp/pgpass0 authentication: replication: username: replicator password: rep-pass superuser: username: postgres password: postgres rewind: username: rewind_user password: rewind_password parameters: unix_socket_directories: '/var/run/postgresql/' tags: nofailover: false noloadbalance: false clonefrom: false nosync: false scope: pgdb-patroni name: postgres2 restapi: listen: xxx.xxx.xx.xx:8008 connect_address: xxx.xxx.xx.xx:8008 etcd: hosts: xxx.xxx.xx.xx:2379,xxx.xxx.xx.xx:2379 bootstrap: dcs: ttl: 30 loop_wait: 10 retry_timeout: 10 maximum_lag_on_failover: 1048576 postgresql: use_pg_rewind: true parameters: wal_level: hot_standby hot_standby: "on" wal_keep_segments: 8 max_wal_senders: 10 max_replication_slots: 10 wal_log_hints: "on" max_connections: 200 shared_buffers: 1GB effective_cache_size: 3GB maintenance_work_mem: 256MB checkpoint_completion_target: 0.7 wal_buffers: 16MB default_statistics_target: 100 random_page_cost: 1.1 effective_io_concurrency: 300 work_mem: 5242kB min_wal_size: 1GB max_wal_size: 4GB max_worker_processes: 2 max_parallel_workers_per_gather: 1 max_parallel_workers: 2 max_parallel_maintenance_workers: 1 archive_mode: "on" archive_timeout: 1800s archive_command: "pgbackrest --stanza=pgdb-patroni archive-push %p" recovery_conf: restore_command: "pgbackrest --stanza=pgdb-patroni archive-get %f %p" standby_mode: "on"
initdb: - encoding: UTF8 - data-checksums pg_hba: - host replication replicator xxx.xxx.xx.xx/24 md5 - host all all 0.0.0.0/0 md5 users: admin: password: admin options: - createrole - createdb postgresql: listen: xxx.xxx.xx.xx:5432 connect_address: xxx.xxx.xx.xx:5432 data_dir: /postgres/data/ bin_dir: /usr/pgsql-12/bin pgpass: /tmp/pgpass0 authentication: replication: username: replicator password: rep-pass superuser: username: postgres password: postgres rewind: username: rewind_user password: rewind_password parameters: unix_socket_directories: '/var/run/postgresql/' tags: nofailover: false noloadbalance: false clonefrom: false nosync: false
patroni service is created more /etc/systemd/system/patroni.service [Unit] Description=Runners to orchestrate a high-availability PostgreSQL After=syslog.target network.target [Service] Type=simple User=postgres Group=postgres ExecStart=/usr/local/bin/patroni /etc/patroni/patroni.yml KillMode=process TimeoutSec=30 Restart=no [Install] WantedBy=multi-user.target
systemctl enable patroni systemctl start patroni systemctl status patroni systemctl stop patroni journalctl -xe -f -u patron
Le stesse conf vengono effettuate in altri server e il servizio viene eseguito.
patronictl -d xxx.xxx.xx.xx list pgdb-patroni + Cluster: pgdb-patroni (xxx.xxx.xx.xx) -+----+-----------+ | Member | Host | Role | State | TL | Lag in MB | +-----------+---------------+--------+---------+----+-----------+ | postgres1 | xxx.xxx.xx.xx | Leader | running | 1 | | | postgres2 | xxx.xxx.xx.xx | | running | 1 | 0 | +-----------+---------------+--------+---------+----+-----------+ Note: Since we haven't installed pgbackrest until now, we may get an error when installing postgresql via patroni on 2. If we restart patroni services after installing backrest, the problem will be solved. Or you can set up a backrest before starting these patrons.
patronictl -d xxx.xxx.xx.xx list pgdb-patroni patronictl -d xxx.xxx.xx.xx reinit pgdb-patroni patronictl -c /etc/patroni/patroni.yml list
