keepalived实现postgresql主从切换

主 keepalived配置文件

[root@bgsbtsp0006-dqf:keepalived]# cat keepalived.conf 

! Configuration File for keepalived

vrrp_script check_pg_alived {
        script "/etc/keepalived/scripts/check_pg.sh"
        interval 2
}


vrrp_instance VI_1 {
    state MASTER
    interface bond0
    virtual_router_id 22
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass abcdefgh
    }


    virtual_ipaddress {
        172.18.1.72/24
    }
   
    notify_master "/etc/keepalived/scripts/master.sh"
    notify_backup "/etc/keepalived/scripts/backup.sh"
    notify_fault "/etc/keepalived/scripts/fault.sh"

   track_script {
       check_pg_alived
   }

}

从 keepalived配置文件

[root@bgsbtsp0006-dqf:keepalived]# cat keepalived.conf 

! Configuration File for keepalived

vrrp_script check_pg_alived {
        script "/etc/keepalived/scripts/check_pg.sh"
        interval 2
}


vrrp_instance VI_1 {
    state BACKUP
    interface bond0
    virtual_router_id 22
    priority 80
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass abcdefgh
    }


    virtual_ipaddress {
        172.18.1.72/24
    }
   
    notify_master "/etc/keepalived/scripts/master.sh"
    notify_backup "/etc/keepalived/scripts/backup.sh"
    notify_fault "/etc/keepalived/scripts/fault.sh"

   track_script {
       check_pg_alived
   }

}

check_pg.sh文件

[root@bgsbtsp0006-dqf:scripts]# cat check_pg.sh 
#!/bin/bash
num=`ps -ef |grep postgresql|grep -v grep |wc -l`
if [ $num -ge 1 ];then
   status=0
else
   status=1
fi
exit $status

master.sh文件

[root@bgsbtsp0006-dqf:scripts]# cat master.sh 
#!/bin/bash
LOGFILE=/etc/keepalived/log/keepalived.log

export PGDATABASE=postgres
export PGPORT=5432
export PGUSER=postgres
export PGBIN=/opt/postgresql/bin
LOGFILE=/etc/keepalived/log/keepalived.log




SQL1='SELECT pg_is_in_recovery from pg_is_in_recovery();'

db_role=`echo $SQL1  | ${PGBIN}/psql  -d $PGDATABASE -U $PGUSER -At -w`

if [ $db_role == 't' ];then
   echo -e `date +"%F %T"` "the current database is standby DB! [切换至master角色] " >> $LOGFILE
   su - postgres <<EOF
   /opt/postgresql/bin/pg_ctl promote -D /opt/postgresql/data
EOF

else
   echo -e `date +"%F %T"` "the current database is master DB!" >> $LOGFILE
fi

backup.sh文件

[root@bgsbtsp0006-dqf:scripts]# cat backup.sh 
#!/bin/bash

export PGDATABASE=postgres
export PGPORT=5432
export PGUSER=postgres
export PGBIN=/opt/postgresql/bin
LOGFILE=/etc/keepalived/log/keepalived.log


SQL1='SELECT pg_is_in_recovery from pg_is_in_recovery();'

db_role=`echo $SQL1  | ${PGBIN}/psql  -d $PGDATABASE -U $PGUSER -At -w`

if [ $db_role == 't' ];then
   echo -e `date +"%F %T"` "the current database is standby DB!" >> $LOGFILE
else
   echo -e `date +"%F %T"` "the current database is master DB!" >> $LOGFILE
fi

fault.sh 文件

[root@bgsbtsp0006-dqf:scripts]# cat fault.sh 
#!/bin/bash
LOGFILE=/etc/keepalived/log/keepalived.log
num=`ps -ef |grep postgresql|grep -v grep |wc -l`
if [ $num -ge 1 ];then
  echo -e `date +"%F %T"` "主库未down机" >> $LOGFILE
else
  echo -e `date +"%F %T"` "主库down机!" >> $LOGFILE
fi

主postgresql.conf

[root@bgsbtsp0006-dqf:data]# cat postgresql.conf |grep -v "^#" |grep -v "^$"|grep -v $'^\t'
listen_addresses = '*'		# what IP address(es) to listen on;
port = 5432				# (change requires restart)
max_connections = 500			# (change requires restart)
superuser_reserved_connections = 10	# (change requires restart)
shared_buffers = 128MB			# min 128kB
dynamic_shared_memory_type = posix	# the default is the first option
wal_level = logical			# minimal, replica, or logical
full_page_writes = on			# recover from partial page writes
wal_log_hints = on			# also do full page writes of non-critical updates
archive_mode = on		# enables archiving; off, on, or always
archive_command = '/bin/true'		# command to use to archive a logfile segment
max_wal_senders = 10		# max number of walsender processes
wal_keep_segments = 64		# in logfile segments, 16MB each; 0 disables
hot_standby = on			# "on" allows queries during recovery
log_destination = 'csvlog'		# Valid values are combinations of
logging_collector = on	# Enable capturing of stderr and csvlog
log_directory = 'pg_log'		# directory where log files are written,
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
log_rotation_age = 1d			# Automatic rotation of logfiles will
log_rotation_size = 10MB		# Automatic rotation of logfiles will
log_statement = 'all'			# none, ddl, mod, all
log_timezone = 'PRC'
datestyle = 'iso, mdy'
timezone = 'PRC'
lc_messages = 'en_US.UTF-8'			# locale for system error message
lc_monetary = 'en_US.UTF-8'			# locale for monetary formatting
lc_numeric = 'en_US.UTF-8'			# locale for number formatting
lc_time = 'en_US.UTF-8'				# locale for time formatting
default_text_search_config = 'pg_catalog.english'

从postgresql.conf

[root@bfd-yiz-1p23 /opt/postgresql/data]# cat postgresql.conf |grep -v "^#" |grep -v "^$"|grep -v $'^\t'
listen_addresses = '*'		# what IP address(es) to listen on;
port = 5432				# (change requires restart)
max_connections = 500			# (change requires restart)
superuser_reserved_connections = 10	# (change requires restart)
shared_buffers = 128MB			# min 128kB
dynamic_shared_memory_type = posix	# the default is the first option
wal_level = logical			# minimal, replica, or logical
full_page_writes = on			# recover from partial page writes
wal_log_hints = on			# also do full page writes of non-critical updates
archive_mode = on		# enables archiving; off, on, or always
archive_command = '/bin/true'		# command to use to archive a logfile segment
max_wal_senders = 10		# max number of walsender processes
wal_keep_segments = 64		# in logfile segments, 16MB each; 0 disables
hot_standby = on			# "on" allows queries during recovery
log_destination = 'csvlog'		# Valid values are combinations of
logging_collector = on	# Enable capturing of stderr and csvlog
log_directory = 'pg_log'		# directory where log files are written,
log_filename = 'postgresql-%Y-%m-%d_%H%M%S.log'	# log file name pattern,
log_rotation_age = 1d			# Automatic rotation of logfiles will
log_rotation_size = 10MB		# Automatic rotation of logfiles will
log_statement = 'all'			# none, ddl, mod, all
log_timezone = 'PRC'
datestyle = 'iso, mdy'
timezone = 'PRC'
lc_messages = 'en_US.UTF-8'			# locale for system error message
lc_monetary = 'en_US.UTF-8'			# locale for monetary formatting
lc_numeric = 'en_US.UTF-8'			# locale for number formatting
lc_time = 'en_US.UTF-8'				# locale for time formatting
default_text_search_config = 'pg_catalog.english'

免密钥操作，

pg_hba文件配置

# TYPE  DATABASE        USER            ADDRESS                 METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     trust
# IPv4 local connections:
host    all             all             0.0.0.0/0               trust
# IPv6 local connections:
host    all             all             ::1/128                 trust

host    replication     repl            172.18.1.0/24           trust
host    all             repl            172.18.1.0/24           trust

# Allow replication connections from localhost, by a user with the
# replication privilege.
#local   replication     postgres                                trust
#host    replication     postgres        127.0.0.1/32            trust
#host    replication     postgres        ::1/128                 trust

recovery.conf 文件

recovery_target_timeline = 'latest'
standby_mode = on
primary_conninfo = 'host=172.18.1.22 port=5432 user=repl password=baifendian'		# e.g. 'host=localhost port=5432'

结论是：keepalived得master节点挂了也会执行切换。pg得主挂了也切换。

keepalived实现postgresql主从切换

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