v0.8.0 发布注记
v0.8 重做了服务供给部分，提供了集成外部负载均衡器的扩展接口。
v0.8 针对**服务（Service）**接入部分进行了彻底的重做。现在除了默认的primary, replica服务外，用户可以自行定义新的服务。服务的接口可以支持多种不同的实现，例如L4 DPKG VIP可作为Haproxy的替代品与Pigsty集成。同时，针对用户反馈的一些问题进行了集中处理与改进。
改动内容
v0.8是供给方案定稿版本，此后供给系统的API将保持稳定。
API变更
原有vip与haproxy角色的所有配置项，现在迁移至service角色中。
#------------------------------------------------------------------------------
# SERVICE PROVISION
#------------------------------------------------------------------------------
pg_weight: 100 # default load balance weight (instance level)
# - service - #
pg_services: # how to expose postgres service in cluster?
# primary service will route {ip|name}:5433 to primary pgbouncer (5433->6432 rw)
- name: primary # service name {{ pg_cluster }}_primary
src_ip: "*"
src_port: 5433
dst_port: pgbouncer # 5433 route to pgbouncer
check_url: /primary # primary health check, success when instance is primary
selector: "[]" # select all instance as primary service candidate
# replica service will route {ip|name}:5434 to replica pgbouncer (5434->6432 ro)
- name: replica # service name {{ pg_cluster }}_replica
src_ip: "*"
src_port: 5434
dst_port: pgbouncer
check_url: /read-only # read-only health check. (including primary)
selector: "[]" # select all instance as replica service candidate
selector_backup: "[? pg_role == `primary`]" # primary are used as backup server in replica service
# default service will route {ip|name}:5436 to primary postgres (5436->5432 primary)
- name: default # service's actual name is {{ pg_cluster }}-{{ service.name }}
src_ip: "*" # service bind ip address, * for all, vip for cluster virtual ip address
src_port: 5436 # bind port, mandatory
dst_port: postgres # target port: postgres|pgbouncer|port_number , pgbouncer(6432) by default
check_method: http # health check method: only http is available for now
check_port: patroni # health check port: patroni|pg_exporter|port_number , patroni by default
check_url: /primary # health check url path, / as default
check_code: 200 # health check http code, 200 as default
selector: "[]" # instance selector
haproxy: # haproxy specific fields
maxconn: 3000 # default front-end connection
balance: roundrobin # load balance algorithm (roundrobin by default)
default_server_options: 'inter 3s fastinter 1s downinter 5s rise 3 fall 3 on-marked-down shutdown-sessions slowstart 30s maxconn 3000 maxqueue 128 weight 100'
# offline service will route {ip|name}:5438 to offline postgres (5438->5432 offline)
- name: offline # service name {{ pg_cluster }}_replica
src_ip: "*"
src_port: 5438
dst_port: postgres
check_url: /replica # offline MUST be a replica
selector: "[? pg_role == `offline` || pg_offline_query ]" # instances with pg_role == 'offline' or instance marked with 'pg_offline_query == true'
selector_backup: "[? pg_role == `replica` && !pg_offline_query]" # replica are used as backup server in offline service
pg_services_extra: [] # extra services to be added
# - haproxy - #
haproxy_enabled: true # enable haproxy among every cluster members
haproxy_reload: true # reload haproxy after config
haproxy_policy: roundrobin # roundrobin, leastconn
haproxy_admin_auth_enabled: false # enable authentication for haproxy admin?
haproxy_admin_username: admin # default haproxy admin username
haproxy_admin_password: admin # default haproxy admin password
haproxy_exporter_port: 9101 # default admin/exporter port
haproxy_client_timeout: 3h # client side connection timeout
haproxy_server_timeout: 3h # server side connection timeout
# - vip - #
vip_mode: none # none | l2 | l4
vip_reload: true # whether reload service after config
# vip_address: 127.0.0.1 # virtual ip address ip (l2 or l4)
# vip_cidrmask: 24 # virtual ip address cidr mask (l2 only)
# vip_interface: eth0 # virtual ip network interface (l2 only)
新增选项
# - localization - #
pg_encoding: UTF8 # default to UTF8
pg_locale: C # default to C
pg_lc_collate: C # default to C
pg_lc_ctype: en_US.UTF8 # default to en_US.UTF8
pg_reload: true # reload postgres after hba changes
vip_mode: none # none | l2 | l4
vip_reload: true # whether reload service after config
移除选项
haproxy_check_port # Haproxy相关参数已经被Service定义覆盖
haproxy_primary_port
haproxy_replica_port
haproxy_backend_port
haproxy_weight
haproxy_weight_fallback
vip_enabled # vip_enabled参数被vip_mode覆盖
服务管理
pg_services 与 pg_services_extra 定义了集群中的服务，每一个服务的定义结构如下例所示：
一个服务必须指定以下内容：
-
名称：服务的完整名称以数据库集群名为前缀，以
service.name为后缀，通过-连接。例如在pg-test集群中name=primary的服务，其完整服务名称为pg-test-primary。 -
端口：在Pigsty中，服务默认采用NodePort的形式对外暴露，因此暴露端口为必选项。但如果使用外部负载均衡服务接入方案，您也可以通过其他的方式区分服务。
-
选择器：选择器指定了服务的成员，采用JMESPath的形式，从所有集群实例成员中筛选变量。默认的
[]选择器会选取所有的集群成员。此外
selector_backup会选择或标记用于backup的实例列表（当集群中所有其他成员失效时方才接管服务）
# default service will route {ip|name}:5436 to primary postgres (5436->5432 primary)
- name: default # service's actual name is {{ pg_cluster }}-{{ service.name }}
src_ip: "*" # service bind ip address, * for all, vip for cluster virtual ip address
src_port: 5436 # bind port, mandatory
dst_port: postgres # target port: postgres|pgbouncer|port_number , pgbouncer(6432) by default
check_method: http # health check method: only http is available for now
check_port: patroni # health check port: patroni|pg_exporter|port_number , patroni by default
check_url: /primary # health check url path, / as default
check_code: 200 # health check http code, 200 as default
selector: "[]" # instance selector
haproxy: # haproxy specific fields
maxconn: 3000 # default front-end connection
balance: roundrobin # load balance algorithm (roundrobin by default)
default_server_options: 'inter 3s fastinter 1s downinter 5s rise 3 fall 3 on-marked-down shutdown-sessions slowstart 30s maxconn 3000 maxqueue 128 weight 100'
数据库管理
数据库现在可以对locale的细分选项：lc_ctype与lc_collate分别进行指定。支持这一功能的主要原因是PG的扩展插件pg_trgm需要在lc_ctype!=C的环境中才能正常支持中文。
旧接口定义
pg_databases:
- name: meta # name is the only required field for a database
owner: postgres # optional, database owner
template: template1 # optional, template1 by default
encoding: UTF8 # optional, UTF8 by default
locale: C # optional, C by default
allowconn: true # optional, true by default, false disable connect at all
revokeconn: false # optional, false by default, true revoke connect from public # (only default user and owner have connect privilege on database)
tablespace: pg_default # optional, 'pg_default' is the default tablespace
connlimit: -1 # optional, connection limit, -1 or none disable limit (default)
extensions: # optional, extension name and where to create
- {name: postgis, schema: public}
parameters: # optional, extra parameters with ALTER DATABASE
enable_partitionwise_join: true
pgbouncer: true # optional, add this database to pgbouncer list? true by default
comment: pigsty meta database # optional, comment string for database
新的接口定义
pg_databases:
- name: meta # name is the only required field for a database
# owner: postgres # optional, database owner
# template: template1 # optional, template1 by default
# encoding: UTF8 # optional, UTF8 by default , must same as template database, leave blank to set to db default
# locale: C # optional, C by default , must same as template database, leave blank to set to db default
# lc_collate: C # optional, C by default , must same as template database, leave blank to set to db default
# lc_ctype: C # optional, C by default , must same as template database, leave blank to set to db default
allowconn: true # optional, true by default, false disable connect at all
revokeconn: false # optional, false by default, true revoke connect from public # (only default user and owner have connect privilege on database)
# tablespace: pg_default # optional, 'pg_default' is the default tablespace
connlimit: -1 # optional, connection limit, -1 or none disable limit (default)
extensions: # optional, extension name and where to create
- {name: postgis, schema: public}
parameters: # optional, extra parameters with ALTER DATABASE
enable_partitionwise_join: true
pgbouncer: true # optional, add this database to pgbouncer list? true by default
comment: pigsty meta database # optional, comment string for database