postgresql 主从　patroni

1 安装基础包

1.1 postgres

yum install https://download.postgresql.org/pub/repos/yum/10/redhat/rhel-7-x86_64/pgdg-centos10-10-2.noarch.rpm　gcc -y
yum install -y postgresql10-contrib.x86_64 postgresql10-server.x86_64
yum install postgis25_10.x86_64 -y

1.2 patroni

yum install python36 python36-devel -y

curl https://bootstrap.pypa.io/get-pip.py -o /tmp/get-pip.py

python3.6 /tmp/get-pip.py

pip3 install patroni[etcd] -i https://pypi.douban.com/simple
pip install psycopg2-binary

2 配置, 简单demo

2.1 配置　pg 超级用户密码，流复制用户权限及密码，pg_hba.conf

create user replicator replication login encrypted password 'replicator';

local   all             all                                     trust
host   all             all              127.0.0.1/32            trust
# IPv4 local connections:
host    all             all             10.1.0.0/16             md5
# IPv6 local connections:
host    all             all             ::1/128                 md5
# Allow replication connections from localhost, by a user with the
# replication privilege.
local   replication     all                                     trust
host   replication      all             127.0.0.1/32             trust
host    replication     all             10.1.0.0/16             md5
host    replication     all             ::1/128                 trust

2.2 patroni 配置文件

cat /etc/patroni/patroni_postgresql.yml 
scope: pgha    #集群名
namespace: /pgsql/　　＃etcd path
name: pg_node1  # node 名称　每个节点不同

restapi:
  listen: 10.1.88.82:8008
  connect_address: 10.1.88.82:8008

etcd:
  hosts: 10.1.88.81:2379,10.1.88.82:2379,10.1.88.83:2379
  #host: ip:port  #single etd server
bootstrap:
  # this section will be written into Etcd:/<namespace>/<scope>/config after initializing new cluster
  # and all other cluster members will use it as a `global configuration`
  dcs:
    ttl: 30
    loop_wait: 10
    retry_timeout: 10
    maximum_lag_on_failover: 20485760
    master_start_timeout: 300
#    synchronous_mode: false
    postgresql:
      use_pg_rewind: true
      use_slots: false
      parameters:
        listen_addresses: "*"
        port: 5432
        wal_level: logical
        hot_standby: "on"
        wal_keep_segments: 1000
        max_wal_senders: 10
        #synchronous_standby_names: '*'
        max_connections: 150
        max_replication_slots: 10
        wal_log_hints: "on"

postgresql:
  listen: 0.0.0.0:5432
  connect_address: 10.1.88.82:5432 # local ip
  data_dir: /var/lib/pgsql/10/data
  bin_dir: /usr/pgsql-10/bin
#  config_dir:
  authentication:
    replication:
      username: replicator
      password: replicator
    superuser:
      username: postgres
      password: postgres

#watchdog:
#  mode: automatic # Allowed values: off, automatic, required
#  device: /dev/watchdog
#  safety_margin: 5

tags:
    nofailover: false
    noloadbalance: false
    clonefrom: false
    nosync: false

2.3 　服务配置

cat /usr/lib/systemd/system/patroni.service
[Unit]
Description=Patroni server
Documentation='https://github.com/zalando/patroni,https://www.opsdash.com/blog/postgres-getting-started-patroni.html'
After=syslog.target
After=network.target

[Service]
Type=simple

User=postgres
Group=postgres

# StandardOutput=syslog
WorkingDirectory=/etc/patroni/
ExecStart=/usr/local/bin/patroni /etc/patroni/patroni_postgresql.yml
ExecReload=/bin/kill -HUP $MAINPID
KillMode=mixed
KillSignal=SIGINT

# Do not set any timeout value, so that systemd will not kill postmaster
# during crash recovery.
TimeoutSec=0

[Install]
WantedBy=multi-user.target