PgSQL Provision
How to provision database clusters
选择性执行
指定执行任务
您可以通过ansible的标签机制，可以选择执行剧本的一个子集。
例如，如果您只想执行初始化用户权限系统和模板的部分，则可以通过以下命令进行
./initdb.yml --tags=pg_init
指定执行对象
另外，通过limit子句，您可以选择需要执行的对象：
./initdb.yml -l pg-test
该剧本将会在pg-test集群的所有成员上执行，而不会影响环境中的其他集群。
建议在生产环境中操作时，总是指定-l参数，避免误操作（比如把整个环境中的数据库全抹干净了）
默认任务
使用以下命令可以列出所有基础设施初始化会执行的任务，以及可以使用的标签：
./initdb.yml --list-tasks
默认任务如下：
playbook: ./initdb.yml
play #1 (all): Init database cluster TAGS: []
tasks:
Create os group postgres TAGS: [instal, pg_dbsu, postgres]
postgres : Make sure dcs group exists TAGS: [instal, pg_dbsu, postgres]
postgres : Create dbsu {{ pg_dbsu }} TAGS: [instal, pg_dbsu, postgres]
postgres : Grant dbsu nopass sudo TAGS: [instal, pg_dbsu, postgres]
postgres : Grant dbsu all sudo TAGS: [instal, pg_dbsu, postgres]
postgres : Grant dbsu limited sudo TAGS: [instal, pg_dbsu, postgres]
postgres : Config patroni watchdog support TAGS: [instal, pg_dbsu, postgres]
postgres : Add dbsu ssh no host checking TAGS: [instal, pg_dbsu, postgres]
postgres : Fetch dbsu public keys TAGS: [instal, pg_dbsu, postgres]
postgres : Exchange dbsu ssh keys TAGS: [instal, pg_dbsu, postgres]
postgres : Install offical pgdg yum repo TAGS: [instal, pg_install, postgres]
postgres : Install pg packages TAGS: [instal, pg_install, postgres]
postgres : Install pg extensions TAGS: [instal, pg_install, postgres]
postgres : Link /usr/pgsql to current version TAGS: [instal, pg_install, postgres]
postgres : Add pg bin dir to profile path TAGS: [instal, pg_install, postgres]
postgres : Fix directory ownership TAGS: [instal, pg_install, postgres]
Remove default postgres service TAGS: [instal, pg_install, postgres]
postgres : Check necessary variables exists TAGS: [always, pg_preflight, postgres, preflight]
postgres : Fetch variables via pg_cluster TAGS: [always, pg_preflight, postgres, preflight]
postgres : Set cluster basic facts for hosts TAGS: [always, pg_preflight, postgres, preflight]
postgres : Assert cluster primary singleton TAGS: [always, pg_preflight, postgres, preflight]
postgres : Setup cluster primary ip address TAGS: [always, pg_preflight, postgres, preflight]
postgres : Setup repl upstream for primary TAGS: [always, pg_preflight, postgres, preflight]
postgres : Setup repl upstream for replicas TAGS: [always, pg_preflight, postgres, preflight]
postgres : Debug print instance summary TAGS: [always, pg_preflight, postgres, preflight]
Check for existing postgres instance TAGS: [pg_check, postgres, prepare]
postgres : Set fact whether pg port is open TAGS: [pg_check, postgres, prepare]
Abort due to existing postgres instance TAGS: [pg_check, postgres, prepare]
Clean existing postgres instance TAGS: [pg_check, postgres, prepare]
Shutdown existing postgres service TAGS: [pg_clean, postgres, prepare]
postgres : Remove registerd consul service TAGS: [pg_clean, postgres, prepare]
Remove postgres metadata in consul TAGS: [pg_clean, postgres, prepare]
Remove existing postgres data TAGS: [pg_clean, postgres, prepare]
postgres : Make sure main and backup dir exists TAGS: [pg_dir, postgres, prepare]
Create postgres directory structure TAGS: [pg_dir, postgres, prepare]
postgres : Create pgbouncer directory structure TAGS: [pg_dir, postgres, prepare]
postgres : Create links from pgbkup to pgroot TAGS: [pg_dir, postgres, prepare]
postgres : Create links from current cluster TAGS: [pg_dir, postgres, prepare]
postgres : Copy pg_cluster to /pg/meta/cluster TAGS: [pg_meta, postgres, prepare]
postgres : Copy pg_version to /pg/meta/version TAGS: [pg_meta, postgres, prepare]
postgres : Copy pg_instance to /pg/meta/instance TAGS: [pg_meta, postgres, prepare]
postgres : Copy pg_seq to /pg/meta/sequence TAGS: [pg_meta, postgres, prepare]
postgres : Copy pg_role to /pg/meta/role TAGS: [pg_meta, postgres, prepare]
Copy postgres scripts to /pg/bin/ TAGS: [pg_scripts, postgres, prepare]
postgres : Copy alias profile to /etc/profile.d TAGS: [pg_scripts, postgres, prepare]
Copy psqlrc to postgres home TAGS: [pg_scripts, postgres, prepare]
postgres : Setup hostname to pg instance name TAGS: [pg_hostname, postgres, prepare]
postgres : Copy consul node-meta definition TAGS: [pg_nodemeta, postgres, prepare]
postgres : Restart consul to load new node-meta TAGS: [pg_nodemeta, postgres, prepare]
postgres : Config patroni watchdog support TAGS: [pg_watchdog, postgres, prepare]
postgres : Get config parameter page count TAGS: [pg_config, postgres]
postgres : Get config parameter page size TAGS: [pg_config, postgres]
postgres : Tune shared buffer and work mem TAGS: [pg_config, postgres]
postgres : Hanlde small size mem occasion TAGS: [pg_config, postgres]
Calculate postgres mem params TAGS: [pg_config, postgres]
postgres : create patroni config dir TAGS: [pg_config, postgres]
postgres : use predefined patroni template TAGS: [pg_config, postgres]
postgres : Render default /pg/conf/patroni.yml TAGS: [pg_config, postgres]
postgres : Link /pg/conf/patroni to /pg/bin/ TAGS: [pg_config, postgres]
postgres : Link /pg/bin/patroni.yml to /etc/patroni/ TAGS: [pg_config, postgres]
postgres : Config patroni watchdog support TAGS: [pg_config, postgres]
postgres : create patroni systemd drop-in dir TAGS: [pg_config, postgres]
Copy postgres systemd service file TAGS: [pg_config, postgres]
postgres : create patroni systemd drop-in file TAGS: [pg_config, postgres]
postgres : Render default initdb scripts TAGS: [pg_config, postgres]
postgres : Launch patroni on primary instance TAGS: [pg_primary, postgres]
postgres : Wait for patroni primary online TAGS: [pg_primary, postgres]
Wait for postgres primary online TAGS: [pg_primary, postgres]
Check primary postgres service ready TAGS: [pg_primary, postgres]
postgres : Check replication connectivity to primary TAGS: [pg_primary, postgres]
postgres : Render default pg-init scripts TAGS: [pg_init, pg_init_config, postgres]
postgres : Render template init script TAGS: [pg_init, pg_init_config, postgres]
postgres : Execute initialization scripts TAGS: [pg_init, postgres]
postgres : Check primary instance ready TAGS: [pg_init, postgres]
postgres : Add dbsu password to pgpass if exists TAGS: [pg_pass, postgres]
postgres : Add system user to pgpass TAGS: [pg_pass, postgres]
postgres : Check replication connectivity to primary TAGS: [pg_replica, postgres]
postgres : Launch patroni on replica instances TAGS: [pg_replica, postgres]
postgres : Wait for patroni replica online TAGS: [pg_replica, postgres]
Wait for postgres replica online TAGS: [pg_replica, postgres]
Check replica postgres service ready TAGS: [pg_replica, postgres]
postgres : Render hba rules TAGS: [pg_hba, postgres]
postgres : Reload hba rules TAGS: [pg_hba, postgres]
postgres : Pause patroni TAGS: [pg_patroni, postgres]
postgres : Stop patroni on replica instance TAGS: [pg_patroni, postgres]
postgres : Stop patroni on primary instance TAGS: [pg_patroni, postgres]
Launch raw postgres on primary TAGS: [pg_patroni, postgres]
Launch raw postgres on primary TAGS: [pg_patroni, postgres]
Wait for postgres online TAGS: [pg_patroni, postgres]
postgres : Check pgbouncer is installed TAGS: [pgbouncer, pgbouncer_check, postgres]
postgres : Stop existing pgbouncer service TAGS: [pgbouncer, pgbouncer_clean, postgres]
postgres : Remove existing pgbouncer dirs TAGS: [pgbouncer, pgbouncer_clean, postgres]
Recreate dirs with owner postgres TAGS: [pgbouncer, pgbouncer_clean, postgres]
postgres : Copy /etc/pgbouncer/pgbouncer.ini TAGS: [pgbouncer, pgbouncer_config, postgres]
postgres : Copy /etc/pgbouncer/pgb_hba.conf TAGS: [pgbouncer, pgbouncer_config, postgres]
postgres : Touch userlist and database list TAGS: [pgbouncer, pgbouncer_config, postgres]
postgres : Add default users to pgbouncer TAGS: [pgbouncer, pgbouncer_config, postgres]
postgres : Copy pgbouncer systemd service TAGS: [pgbouncer, pgbouncer_launch, postgres]
postgres : Launch pgbouncer pool service TAGS: [pgbouncer, pgbouncer_launch, postgres]
postgres : Wait for pgbouncer service online TAGS: [pgbouncer, pgbouncer_launch, postgres]
postgres : Check pgbouncer service is ready TAGS: [pgbouncer, pgbouncer_launch, postgres]
postgres : Render business init script TAGS: [business, pg_biz_config, pg_biz_init, postgres]
postgres : Render database baseline sql TAGS: [business, pg_biz_config, pg_biz_init, postgres]
postgres : Execute business init script TAGS: [business, pg_biz_init, postgres]
postgres : Execute database baseline sql TAGS: [business, pg_biz_init, postgres]
postgres : Add pgbouncer busniess users TAGS: [business, pg_biz_pgbouncer, postgres]
postgres : Add pgbouncer busniess database TAGS: [business, pg_biz_pgbouncer, postgres]
postgres : Restart pgbouncer TAGS: [business, pg_biz_pgbouncer, postgres]
Copy postgres service definition TAGS: [pg_register, postgres, register]
postgres : Reload consul service TAGS: [pg_register, postgres, register]
postgres : Render grafana datasource definition TAGS: [pg_grafana, postgres, register]
postgres : Register datasource to grafana TAGS: [pg_grafana, postgres, register]
monitor : Create /etc/pg_exporter conf dir TAGS: [monitor, pg_exporter]
monitor : Copy default pg_exporter.yaml TAGS: [monitor, pg_exporter]
monitor : Config /etc/default/pg_exporter TAGS: [monitor, pg_exporter]
monitor : Config pg_exporter service unit TAGS: [monitor, pg_exporter]
monitor : Launch pg_exporter systemd service TAGS: [monitor, pg_exporter]
monitor : Wait for pg_exporter service online TAGS: [monitor, pg_exporter]
monitor : Register pg-exporter consul service TAGS: [monitor, pg_exporter]
monitor : Reload pg-exporter consul service TAGS: [monitor, pg_exporter]
monitor : Config pgbouncer_exporter opts TAGS: [monitor, pgbouncer_exporter]
monitor : Config pgbouncer_exporter service TAGS: [monitor, pgbouncer_exporter]
monitor : Launch pgbouncer_exporter service TAGS: [monitor, pgbouncer_exporter]
monitor : Wait for pgbouncer_exporter online TAGS: [monitor, pgbouncer_exporter]
monitor : Register pgb-exporter consul service TAGS: [monitor, pgbouncer_exporter]
monitor : Reload pgb-exporter consul service TAGS: [monitor, pgbouncer_exporter]
monitor : Copy node_exporter systemd service TAGS: [monitor, node_exporter]
monitor : Config default node_exporter options TAGS: [monitor, node_exporter]
monitor : Launch node_exporter service unit TAGS: [monitor, node_exporter]
monitor : Wait for node_exporter online TAGS: [monitor, node_exporter]
monitor : Register node-exporter service TAGS: [monitor, node_exporter]
monitor : Reload node-exporter consul service TAGS: [monitor, node_exporter]
proxy : Templating /etc/default/vip-manager.yml TAGS: [proxy, vip]
proxy : create vip-manager. systemd drop-in dir TAGS: [proxy, vip]
proxy : create vip-manager systemd drop-in file TAGS: [proxy, vip]
proxy : Launch vip-manager TAGS: [proxy, vip]
proxy : Set pg_instance in case of absence TAGS: [haproxy, proxy]
proxy : Fetch postgres cluster memberships TAGS: [haproxy, proxy]
Templating /etc/haproxyhaproxy.cfg TAGS: [haproxy, proxy]
Copy haproxy systemd service file TAGS: [haproxy, proxy]
Launch haproxy load balancer service TAGS: [haproxy, proxy]
Wait for haproxy load balancer online TAGS: [haproxy, proxy]
Copy haproxy service definition TAGS: [haproxy_register, proxy]
Reload haproxy consul service TAGS: [haproxy_register, proxy]
Last modified 2021-01-10: update en docs (9c05029)