os: centos 7.4.1708
db: postgresql 11.8
Slony-I: 2.2.8
192.168.56.111 n1
192.168.56.112 n2
192.168.56.113 n3
這3個節點都需要安裝 postgresql 11 及 Slony-I
<<Slony-I 之二 master 節點 + 1目標節點>>
上篇 blog 實現了1對1的功能,本次追加一個n3節點,實現 1對2。
版本
# cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)
#
#
# yum list installed |grep -i postgresql
postgresql11.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-contrib.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-debuginfo.x86_64 11.5-1PGDG.rhel7 @pgdg11
postgresql11-devel.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-docs.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-libs.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-llvmjit.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-odbc.x86_64 12.01.0000-1PGDG.rhel7 @pgdg11
postgresql11-plperl.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-plpython.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-pltcl.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-server.x86_64 11.8-1PGDG.rhel7 @pgdg11
postgresql11-tcl.x86_64 2.4.0-2.rhel7.1 @pgdg11
postgresql11-test.x86_64 11.8-1PGDG.rhel7 @pgdg11
# su - postgres
Last login: Wed Jan 15 18:34:12 CST 2020 on pts/0
$
$
$ psql -c "select version();"
version
---------------------------------------------------------------------------------------------------------
PostgreSQL 11.8 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-39), 64-bit
(1 row)
n3 節點創建目標表
yewu 用戶 yewudb 數據庫創建參考上一篇 blog <<Slony-I 之二 master 節點 + 1目標節點>>
表必須要有主鍵
$ psql -U yewu yewudb
psql (11.8)
Type "help" for help.
yewudb=> create table tmp_t0(c0 int8 primary key,c1 varchar(100));
配置 slony
# su - postgres
$ ls -l /usr/pgsql-11/bin/sl*
-rwxr-xr-x 1 root root 496208 Jun 10 17:10 /usr/pgsql-11/bin/slon
-rwxr-xr-x 1 root root 315976 Jun 10 17:10 /usr/pgsql-11/bin/slonik
-rwxr-xr-x 1 root root 176736 Jun 10 17:10 /usr/pgsql-11/bin/slony_logshipper
n3 節點初始化數據
n1 節點使用 pg_dump 導出指定表的數據到 n3 節點。
n1 節點(master 節點) 添加節點腳本
# su - postgres
$ vi slon_addnode_n3.sh
#!/bin/sh
slonik <<_EOF_
#--
cluster name = slony_example;
#--
node 3 admin conninfo = 'dbname=yewudb host=192.168.56.113 port=5432 user=slony password=slonyslony';
node 1 admin conninfo = 'dbname=yewudb host=192.168.56.111 port=5432 user=slony password=slonyslony';
#--
store node (id=3, comment = 'Slave node n3', event node=1);
_EOF_
執行腳本
$ slon_addnode_n3.sh
n1 節點(master 節點) 添加path腳本
# su - postgres
$ vi slon_addnode_n3_path.sh
#!/bin/sh
slonik <<_EOF_
#--
cluster name = slony_example;
#--
node 3 admin conninfo = 'dbname=yewudb host=192.168.56.113 port=5432 user=slony password=slonyslony';
node 1 admin conninfo = 'dbname=yewudb host=192.168.56.111 port=5432 user=slony password=slonyslony';
#--
store path (server = 1, client = 3, conninfo='dbname=yewudb host=192.168.56.111 port=5432 user=slony password=slonyslony');
store path (server = 3, client = 1, conninfo='dbname=yewudb host=192.168.56.113 port=5432 user=slony password=slonyslony');
_EOF_
執行腳本
$ slon_addnode_n3_path.sh
n1 節點(master 節點) 添加訂閱腳本
# su - postgres
$ vi slon_addnode_n3_subs.sh
#!/bin/sh
slonik <<_EOF_
#--
cluster name = slony_example;
#--
node 3 admin conninfo = 'dbname=yewudb host=192.168.56.113 port=5432 user=slony password=slonyslony';
node 1 admin conninfo = 'dbname=yewudb host=192.168.56.111 port=5432 user=slony password=slonyslony';
# subscribe
subscribe set ( id = 1, provider = 1, receiver = 3, forward = yes);
_EOF_
執行腳本
$ slon_addnode_n3_subs.sh
n3 節點啓動守護進程
# su - postgres
$ slon slony_example 'dbname=yewudb host=192.168.56.113 port=5432 user=slony password=slonyslony';
驗證 slony
n1 節點插入測試數據
$ psql -U yewu yewudb
yewudb=> insert into tmp_t0 select 999999,'this is slony test n3';
yewudb=> select * from tmp_t0 where c0=999999;
c0 | c1
--------+-----------------------
999999 | this is slony test n3
(1 row)
n3 節點驗證
yewudb=> select * from tmp_t0 where c0=999999;
c0 | c1
--------+-----------------------
999999 | this is slony test n3
(1 row)
查看錶信息
slony 添加了觸發器
n3 節點查看
yewudb=# \d+ tmp_t0
Table "public.tmp_t0"
Column | Type | Collation | Nullable | Default | Storage | Stats target | Description
--------+------------------------+-----------+----------+---------+----------+--------------+-------------
c0 | bigint | | not null | | plain | |
c1 | character varying(100) | | | | extended | |
Indexes:
"tmp_t0_pkey" PRIMARY KEY, btree (c0)
Triggers:
_slony_example_denyaccess BEFORE INSERT OR DELETE OR UPDATE ON tmp_t0 FOR EACH ROW EXECUTE PROCEDURE _slony_example.denyaccess('_slony_example')
_slony_example_truncatedeny BEFORE TRUNCATE ON tmp_t0 FOR EACH STATEMENT EXECUTE PROCEDURE _slony_example.deny_truncate()
Disabled user triggers:
_slony_example_logtrigger AFTER INSERT OR DELETE OR UPDATE ON tmp_t0 FOR EACH ROW EXECUTE PROCEDURE _slony_example.logtrigger('_slony_example', '1', 'k')
_slony_example_truncatetrigger BEFORE TRUNCATE ON tmp_t0 FOR EACH STATEMENT EXECUTE PROCEDURE _slony_example.log_truncate('1')
參考:
http://slony.info/
https://www.slony.info/documentation/2.2/index.html
https://www.slony.info/documentation/2.2/modifyingthings.html