• PostgreSQL+pgpooll+Keepalived双机HA方案


    PostgreSQL+pgpooll+Keepalived双机HA方案

    (注:本文档中的所有操作在没有说明的情况下都应该使用postgres用户进行操作,postgres用户没有权限的操作方可采用root用户进行操作,可以在本方案中使用postgres用户及该用户的密码替换replcia及replica用户的密码)

     

    方案逻辑图

     

    192.168.100.3的pgpool故障图

     

    192.168.100.4的pgpool故障图

     

    192.168.100.3的Master故障图

     

    一、环境信息

    操作系统:CentOS6.6

    数据库:PostgreSQL9.3.5

    物理机两台:node1,node2

    Keepalived:keepalived-1.2.15

    pgpool:pgpool-II-3.3.3

    一、     安装Linux操作系统CentOS6.6(两台物理机操作)

    主节点:node1:IP:192.168.100.3

    备节点:node2:IP:192.168.2.4

    VIP:192.168.100.4

    二、     安装完Linux操作系统之后的系统调整(两台物理机操作)

    2.1主备节点时钟同步:

    /usr/sbin/ntpdate asia.pool.ntp.org && /sbin/hwclock –systohc

     

    2.2给两个机器分别命名:node1,node2

     

    第一台机器命名为node1

    2.2.1 修改/etc/sysconfig/network中的hostname
    vi /etc/sysconfig/network
    HOSTNAME=node1 #修改localhost.localdomain为node1

    2.2.2 修改/etc/hosts文件
    vi /etc/hosts
    127.0.0.1 node1 localhost #修改localhost.localdomain为node1
    shutdown -r now #最后,重启服务器即可

     

    第二台机器命名为node2

    2.2.3 修改/etc/sysconfig/network中的hostname
    vi /etc/sysconfig/network
    HOSTNAME=node2 #修改localhost.localdomain为node2

    2.2.4 修改/etc/hosts文件
    vi /etc/hosts
    127.0.0.1 node2 localhost #修改localhost.localdomain为node2
    shutdown -r now #最后,重启服务器即可。

     

    2.3.OS资源调整

    时区调整: (如果已经调好同步不需要做)

    vi /etc/sysconfig/clock

    ZONE="Asia/Shanghai"

    UTC=false

    ARC=false

    vi /etc/sysconfig/i18n

    LANG="en_US.UTF-8"

     

    vi /etc/sysctl.conf

    kernel.shmmni = 4096

    kernel.sem = 50100 64128000 50100 1280

    fs.file-max = 7672460

    net.ipv4.ip_local_port_range = 9000 65000

    net.core.rmem_default = 1048576

    net.core.rmem_max = 4194304

    net.core.wmem_default = 262144

    net.core.wmem_max = 1048576

    net.ipv4.tcp_tw_recycle = 1

    net.ipv4.tcp_max_syn_backlog = 4096

    net.core.netdev_max_backlog = 10000

    vm.overcommit_memory = 0

    net.ipv4.ip_conntrack_max = 655360

    fs.aio-max-nr = 1048576

    net.ipv4.tcp_timestamps = 0

    使文件修改生效

    sysctl –p

     

    vi /etc/security/limits.conf

    * soft nofile 131072

    * hard nofile 131072

    * soft nproc 131072

    * hard nproc 131072

    * soft core unlimited

    * hard core unlimited

    * soft memlock 50000000

    * hard memlock 50000000

     

    vi /etc/sysconfig/selinux

    SELINUX=disabled

    setenforce 0

     

    防火墙根据需要配置

     

    vi /etc/sysconfig/iptables

    -A INPUT -s 192.168.0.0/16 -j ACCEPT

    -A INPUT -s 10.0.0.0/8 -j ACCEPT

    -A INPUT -s 172.16.0.0/16 -j ACCEPT

    # or

    -A INPUT -m state --state NEW -m tcp -p tcp --dport 5432 -j ACCEPT

     

    service iptables restart

     

    2.4.给两个节点分别创建postgres用户并设置密码

    useradd postgres

    password:postgres

     

    2.5.配置两台机器的ssh免密钥登录

    [postgres@node1]$ ssh-keygen -t rsa

    Generating public/private rsa key pair.

    Enter file in which to save the key (/var/lib/pgsql/.ssh/id_rsa):

    Enter passphrase (empty for no passphrase):

    Enter same passphrase again:

    Your identification has been saved in /var/lib/pgsql/.ssh/id_rsa.

    Your public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.

    The key fingerprint is:

    [postgres@node1]$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

    [postgres@node1]$ chmod go-rwx ~/.ssh/*

    [postgres@node2$ ssh-keygen -t rsa

    Generating public/private rsa key pair.

    Enter file in which to save the key (/var/lib/pgsql/.ssh/id_rsa):

    Enter passphrase (empty for no passphrase):

    Enter same passphrase again:

    Your identification has been saved in /var/lib/pgsql/.ssh/id_rsa.

    Your public key has been saved in /var/lib/pgsql/.ssh/id_rsa.pub.

    The key fingerprint is:

    [postgres@node2$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

    [postgres@node2$ chmod go-rwx ~/.ssh/*

     

    [postgres@node1]$ cd ~/.ssh

    [postgres@node1]$ scp id_rsa.pub  postgres@node2:/home/postgres/.ssh/id_rsa.pub1

    [postgres@node2] cd ~/.ssh

    [postgres@node2] cat id_rsa.pub1 | authorized_keys

    [postgres@node2]scp id_rsa.pub postgres@node1:/home/postgres/.ssh/id_rsa.pub2

    [postgres@node1] cat id_rsa.pub2| authorized_keys

    2.6.创建源码包存储目录

    在两个节点的/opt/目录下分别创建soft_bak目录用于存放软件安装包如:postgresql-9.3.5.tar.gz

    mkdir /opt/soft_bak

    设置相关目录的所属主

    postgresql必须用postgres 用户安装,安装之前先改变postgresql的将要安装的目录的权限

    chown –R postgres:postgres  /opt/soft_bak

    chown –R postgres:postgres  /usr/local/

     

    三、安装PG的依赖软件包:

    yum -y install lrzsz sysstat e4fsprogs ntp readline-devel zlib zlib-devel openssl openssl-devel pam-devel libxml2-devel libxslt-devel python-devel tcl-devel gcc make flex bison

     

    四、下载PostgreSQL 9.3.5 pgpool-II-3.3.3.tar.gz keepalived-1.2.15

    在安装PG之前

    /opt/soft_bak文件夹下应该有postgresql-9.3.5.tar.gz pgpool-II-3.4.0.tar.gz 等

     

    五、安装PostgreSQL

    主库(postgres用户安装)

    cd /opt/soft_bak/

    tar zxvf postgresql-9.3.5.tar.gz

    cd /opt/soft_bak/postgresql-9.3.5

    ./configure  --with-pgport=5432 --with-perl --with-tcl --with-python --with-openssl --with-pam --without-ldap --with-libxml --with-libxslt --with-blocksize=8

    gmake world

    gmake install-world

     

    备库(postgres用户安装 备节点只需要安装软件,不需要init数据库)

    cd /opt/soft_bak/

    tar zxvf postgresql-9.3.5.tar.gz

    cd /opt/soft_bak/postgresql-9.3.5

    ./configure  --with-pgport=5432 --with-perl --with-tcl --with-python --with-openssl --with-pam --without-ldap --with-libxml --with-libxslt --with-blocksize=8

    gmake world

    gmake install-world

     

    六、主备节点设置相关环境变量(主备节点应该一致)

    vi /home/postgres/.bash_profile

    export PGPORT=5432

    export PGDATA=/file/data

    export LANG=en_US.utf8

    export PGHOME=/usr/local/pgsql

    export LD_LIBRARY_PATH=$PGHOME/lib:/lib64:/usr/lib64:/usr/local/lib64:/lib:/usr/lib:/usr/local/lib:$LD_LIBRARY_PATH

    export DATE=`date +"%Y%m%d%H%M"`

    export PATH=$PGHOME/bin:$PATH:.

    export MANPATH=$PGHOME/share/man:$MANPATH

    export PGUSER=postgres

    export PGHOST=$PGDATA

    export PGDATABASE=postgres

    alias rm='rm -i'

    alias ll='ls -lh'

     

    在/home/postgres/目录下创建.pgpass(用于主备之间数据传输的流复制用户)

    格式:

    IP:端口:replication:用户:密码

    (master)(在不创建replica用户的情况下可以使用postgres用户和postgres用户的密码)

    192.168.100.3:5432:replication:replica:replica

    192.168.2.4:5432:replication:replica:replica

    (standby) (在不创建replica用户的情况下可以使用postgres用户和postgres用户的密码)

    192.168.100.3:5432:replication:replica:replica

    192.168.2.4:5432:replication:replica:replica

     

    七、主节点初始化postgreSQL实例

    su - postgres

    initdb -D $PGDATA -E UTF8 --locale=C -U postgres -W

    八、PostgreSQL配置文件调整

    cd $PGDATA

    vi postgresql.conf

    listen_addresses = '0.0.0.0'

    max_connections = 1000

    superuser_reserved_connections = 13

    unix_socket_directory = '$PGDATA'

    unix_socket_permissions = 0700

    tcp_keepalives_idle = 60

    tcp_keepalives_interval = 10

    tcp_keepalives_count = 10

    shared_buffers = 2GB

    maintenance_work_mem = 512MB

    max_stack_depth = 8MB

    vacuum_cost_delay = 10ms

    vacuum_cost_limit = 10000

    bgwriter_delay = 10ms

    wal_level = hot_standby

    wal_buffers = 16384kB
    checkpoint_segments = 64

    checkpoint_timeout = 5min

    archive_mode = on

    archive_command = '/bin/date'

    max_wal_senders = 32

    hot_standby = on

    random_page_cost = 2.0

    effective_cache_size = 12000MB

    log_destination = 'csvlog'

    logging_collector = on

    log_directory = 'pg_log'

    log_truncate_on_rotation = on

    log_rotation_age = 1d

    log_rotation_size = 10MB

    log_min_duration_statement = 1s

    log_checkpoints = on

    log_lock_waits = on

    deadlock_timeout = 1s

    log_connections = on

    log_disconnections = on

    log_error_verbosity = verbose

    log_statement = 'ddl'

    track_activity_query_size = 2048

    autovacuum = on

    log_autovacuum_min_duration = 0

    log_timezone = 'PRC'

    datestyle = 'iso, mdy'

    timezone = 'PRC'

    lc_messages = 'C'                               

    lc_monetary = 'C'                               

    lc_numeric = 'C'                                

    lc_time = 'C'                                   

    default_text_search_config = 'pg_catalog.english'

    shared_preload_libraries = 'pg_stat_statements,auto_explain'

    pg_stat_statements.max = 1000

    pg_stat_statements.track = all

    pg_stat_statements.track_utility = off

    track_io_timing = off

    custom_variable_class = ‘pg_stat_statements,auto_explain’

    pg_stat_statements.max = 1000

    pg_stat_statements.track = all

    auto_explain.log_min_duration = 10ms

    auto_explain.log_analyze = false

    auto_explain.log_verbose = false

    auto_explain.log_nested_statements = false

     

    九、使系统具有监控SQL功能

    su - postgres

    pg_clt –D $PGDATA start

    psql –h node1 –p 5432 –U postgres –d postgres

    postgres=#create extention pg_stat_statements;

    postgres=#select pg_stat_statements_reset();

    //select * from pg_stat_statements;

     

    十、主备方案postgresql.conf pg_hba.conf的配置

    vim postgres.conf

      listen_addresses='*'

      wal_level = 'hot_standby'

      archive_mode = on

      archive_command = 'cd ./'  # we can also use exit 0

      max_wal_senders = 10

      wal_keep_segments = 5000   # 80 GB required on pg_xlog

      hot_standby = on

    vim pg_hba.conf

    host    all             all               192.168.2.4/32          trust

    host    postgres        postgres          192.168.2.4/32          trust

    host    replication      replica            192.168.2.4/32          trust

    host    all             all               192.168.100.3/32        trust

    host    postgres        postgres          192.168.100.3/32        trust

    host    replica         replica           192.168.100.3/32        trust

     

    十一 主备节点标志文件的配置

    su – postgres

    cp /usr/local/pgsql/share/recovery.conf.sample  /file/data/recovery.done

    standby_mode = on

    recovery_target_timeline =’latest’时间线

    primary_conninfo = ‘host=node2 port=5432 user=postgres’主节点信息

    trigger_file = ‘/file/data/trigger_file’

    十二、生成备库实例(node2上执行)

    su – postgres

    pg_basebackup –D $PGDATA –Fp –Xs –v –P –h node1 –p主库端口号 –U replica(postgres)

    十三、修改备库实例的备库标识文件

    cd /file/data

    mv recovery.done recovery.conf

    vim recovery.conf

    standby_mode = on

    recovery_target_timeline =’latest’时间线

    primary_conninfo = ‘host=node1 port=5432 user=postgres’主节点信息

    trigger_file = ‘/file/data/trigger_file’

     

    启动备库

    chmod 0700 /file/data

    pg_ctl –D $PGDATA

    查看备库进程

    ps –ef|grep postgres

    查看主库进程

    ps –ef|grep postgres

     

    十四、安装pgpool-II3.3.3(两个节点操作)

    将pgpool-II3.3.3下载到/opt/soft_bak

    创建pgpool的安装目录

    mkdir /opt/pgpool

    su - postgres

    tar zxvf pgpool-II-3.3.3.tar.gz

    cd pgpool-II-3.3.3

    mkdir -p /opt/pgpool

    ./configure --prefix=/opt/pgpool/ --with-pgsql=/usr/local/pgsql/ --with-pgsql-libdir=/opt/pgsql/lib/ --with-pgsql-includedir=/opt/pgsql/include/

    make

    make install

    cd src/sql

    [postgres@node1 sql]$ cd pgpool_adm/

    [postgres@node1 pgpool_adm]$ make

    [postgres@node1 pgpool_adm]$ make install

    [postgres@node1 pgpool_adm]$ cd ..

    [postgres@node1 sql]$ cd pgpool-recovery/

    [postgres@node1 pgpool-recovery]$ make

    [postgres@node1 pgpool-recovery]$ make install

    [postgres@node1 pgpool-recovery]$ cd ..

    [postgres@node1 sql]$ cd pgpool-regclass/

    [postgres@node1 pgpool-regclass]$ make

    [postgres@node1 pgpool-regclass]$ make install

    十五、安装 pgpool 相关函数

    su – postgres

    cd pgpool-II-3.3.3/sql

    make

    make install

    cd pgpool-recovery

    make install

    cd pgpool-regclass

    make install

     

    echo “export PATH=” $PATH:/opt/pgpool/bin” " >>/home/postgres/.bashrc

    source /home/postgres/.bashrc

     

    安装完以后/usr/local/pgsql/share/extension/目录下应该有如下文件

    pgpool_recovery--1.0.sql
    pgpool_recovery.control
    pgpool-recovery.sql
    pgpool_regclass--1.0.sql
    pgpool_regclass.control
    pgpool-regclass.sql

    su - postgres

    psql template1   (备节点不需要创建pgpool_regclass,pgpool_recovery)

    template1=# create extension pgpool_regclass;
    CREATE EXTENSION
    template1=# CREATE EXTENSION pgpool_recovery;
    CREATE EXTENSION

    查看新增加的  recovery 管理函数
    template1=# df
                                                         List of functions
     Schema |        Name         | Result data type |                      Argument data types                       |  Type  
    --------+---------------------+------------------+----------------------------------------------------------------+--------
     public | pgpool_pgctl        | boolean          | action text, stop_mode text                                    | normal
     public | pgpool_recovery     | boolean          | script_name text, remote_host text, remote_data_directory text | normal
     public | pgpool_remote_start | boolean          | remote_host text, remote_data_directory text                   | normal
     public | pgpool_switch_xlog  | text             | arcive_dir text                                                | normal
    (4 rows)

    十六、配置 pgpool-II ( 两节点操作)
    --配置  pcp.conf

    cd /opt/pgpool/etc
    cp pcp.conf.sample pcp.conf
    pg_md5 -u postgres -p
    password: postgres
    ba777e4c2f15c11ea8ac3be7e0440aa0

    vim pcp.conf

    --编写 pcp.conf 文件,写入以下

    # USERID:MD5PASSWD
    postgres:ba777e4c2f15c11ea8ac3be7e0440aa0

    --配置 ifconfig, arping 执行权限(由root用户执行)

    # chmod u+s /sbin/ifconfig
    # chmod u+s /usr/sbin/

    --配置 pgpool.conf

    cd /opt/pgpool/etc         
    cp pgpool.conf.sample pgpool.conf

    --主节点的 pgpool.conf(配置文件中的用户名和配置能用postgres用户就用postgres用户,尽量减少用户)
    listen_addresses = '*'
    port = 9999
    socket_dir = '/opt/pgpool'
    pcp_port = 9898
    pcp_socket_dir = '/opt/pgpool'
    backend_hostname0 = 'node1'   ##配置数据节点 node1
    backend_port0 = 5432
    backend_weight0 = 1
    backend_flag0 = 'ALLOW_TO_FAILOVER'
    backend_hostname1 = 'node2'   ##配置数据节点  node2
    backend_port1 = 5432
    backend_weight1 = 1
    backend_flag1 = 'ALLOW_TO_FAILOVER'
    enable_pool_hba = on
    pool_passwd = 'pool_passwd'
    authentication_timeout = 60
    ssl = off
    num_init_children = 32
    max_pool = 4
    child_life_time = 300
    child_max_connections = 0
    connection_life_time = 0
    client_idle_limit = 0
    log_destination = 'syslog'
    print_timestamp = on
    log_connections = on
    log_hostname = on
    log_statement = on
    log_per_node_statement = off
    log_standby_delay = 'none'
    syslog_facility = 'LOCAL0'
    syslog_ident = 'pgpool'
    debug_level = 0
    pid_file_name = '/opt/pgpool/pgpool.pid'
    logdir = '/tmp'
    connection_cache = on
    reset_query_list = 'ABORT; DISCARD ALL'
    replication_mode = off
    replicate_select = off
    insert_lock = on
    lobj_lock_table = ''
    replication_stop_on_mismatch = off
    failover_if_affected_tuples_mismatch = off
    load_balance_mode = on
    ignore_leading_white_space = on
    white_function_list = ''
    black_function_list = 'nextval,setval'
    master_slave_mode = on # 设置流复制模式
    master_slave_sub_mode = 'stream' # 设置流复制模式
    sr_check_period = 5
    sr_check_user = 'replica'
    sr_check_password = 'replica'
    delay_threshold = 16000
    follow_master_command = ''
    parallel_mode = off
    pgpool2_hostname = ''
    system_db_hostname  = 'localhost'
    system_db_port = 5432
    system_db_dbname = 'pgpool'
    system_db_schema = 'pgpool_catalog'
    system_db_user = 'pgpool'
    system_db_password = ''
    health_check_period = 5
    health_check_timeout = 20
    health_check_user = 'replica'
    health_check_password = 'replcia'
    health_check_max_retries = 3
    health_check_retry_delay = 1
    failover_command = '/opt/pgpool/failover_stream.sh  %d %H /file/data/trigger_file' 
    failback_command = ''
    fail_over_on_backend_error = on
    search_primary_node_timeout = 10
    recovery_user = 'nobody'
    recovery_password = ''
    recovery_1st_stage_command = ''
    recovery_2nd_stage_command = ''
    recovery_timeout = 90
    client_idle_limit_in_recovery = 0
    use_watchdog = on
    trusted_servers = ''
    ping_path = '/bin'
    wd_hostname = 'node1'
    wd_port = 9000
    wd_authkey = ''
    delegate_IP = '' 
    ifconfig_path = '/sbin'  
    if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
    if_down_cmd = 'ifconfig eth0:0 down'
    arping_path = '/usr/sbin'           # arping command path
    arping_cmd = 'arping -U $_IP_$ -w 1'
    clear_memqcache_on_escalation = on
    wd_escalation_command = ''
    wd_lifecheck_method = 'heartbeat'
    wd_interval = 10
    wd_heartbeat_port = 9694
    wd_heartbeat_keepalive = 2
    wd_heartbeat_deadtime = 30
    heartbeat_destination0 = 'node2'   # 配置对端的 hostname
    heartbeat_destination_port0 = 9694
    heartbeat_device0 = 'eth0'
    wd_life_point = 3
    wd_lifecheck_query = 'SELECT 1'
    wd_lifecheck_dbname = 'template1'
    wd_lifecheck_user = 'nobody'
    wd_lifecheck_password = ''
    other_pgpool_hostname0 = 'node2'   ## 配置对端的 pgpool
    other_pgpool_port0 = 9999
    other_wd_port0 = 9000
    relcache_expire = 0
    relcache_size = 256
    check_temp_table = on
    memory_cache_enabled = off
    memqcache_method = 'shmem'
    memqcache_memcached_host = 'localhost'
    memqcache_memcached_port = 11211
    memqcache_total_size = 67108864
    memqcache_max_num_cache = 1000000
    memqcache_expire = 0
    memqcache_auto_cache_invalidation = on
    memqcache_maxcache = 409600
    memqcache_cache_block_size = 1048576
    memqcache_oiddir = '/opt/pgpool/oiddir'(需要现在/opt/pgpool目录下创建oiddr)
    white_memqcache_table_list = ''
    black_memqcache_table_list = ''

    --备节点的 pgpool.conf

    pgpool.conf
    listen_addresses = '*'
    port = 9999
    socket_dir = '/opt/pgpool'
    pcp_port = 9898
    pcp_socket_dir = '/opt/pgpool'
    backend_hostname0 = 'node1'
    backend_port0 = 5432
    backend_weight0 = 1
    backend_flag0 = 'ALLOW_TO_FAILOVER'
    backend_hostname1 = 'node2'
    backend_port1 = 5432
    backend_weight1 = 1
    backend_flag1 = 'ALLOW_TO_FAILOVER'
    enable_pool_hba = on
    pool_passwd = 'pool_passwd'
    authentication_timeout = 60
    ssl = off
    num_init_children = 32
    max_pool = 4
    child_life_time = 300
    child_max_connections = 0
    connection_life_time = 0
    client_idle_limit = 0
    log_destination = 'syslog'
    print_timestamp = on
    log_connections = on
    log_hostname = on
    log_statement = on
    log_per_node_statement = off
    log_standby_delay = 'none'
    syslog_facility = 'LOCAL0'
    syslog_ident = 'pgpool'
    debug_level = 0
    pid_file_name = '/opt/pgpool/pgpool.pid'
    logdir = '/tmp'
    connection_cache = on
    reset_query_list = 'ABORT; DISCARD ALL'
    replication_mode = off
    replicate_select = off
    insert_lock = on
    lobj_lock_table = ''
    replication_stop_on_mismatch = off
    failover_if_affected_tuples_mismatch = off
    load_balance_mode = on
    ignore_leading_white_space = on
    white_function_list = ''
    black_function_list = 'nextval,setval'
    master_slave_mode = on
    master_slave_sub_mode = 'stream'
    sr_check_period = 0
    sr_check_user = 'replica'
    sr_check_password = 'replica'
    delay_threshold = 16000
    follow_master_command = ''
    parallel_mode = off
    pgpool2_hostname = ''
    system_db_hostname  = 'localhost'
    system_db_port = 5432
    system_db_dbname = 'pgpool'
    system_db_schema = 'pgpool_catalog'
    system_db_user = 'pgpool'
    system_db_password = ''
    health_check_period = 0
    health_check_timeout = 20
    health_check_user = 'nobody'
    health_check_password = ''
    health_check_max_retries = 0
    health_check_retry_delay = 1
    failover_command = '/opt/pgpool/failover_stream.sh  %d %H /file/data/trigger/file'
    failback_command = ''
    fail_over_on_backend_error = on
    search_primary_node_timeout = 10
    recovery_user = 'nobody'
    recovery_password = ''
    recovery_1st_stage_command = ''
    recovery_2nd_stage_command = ''
    recovery_timeout = 90
    client_idle_limit_in_recovery = 0
    use_watchdog = off
    trusted_servers = ''
    ping_path = '/bin'
    wd_hostname = ' '
    wd_port = 9000
    wd_authkey = ''
    delegate_IP = ' '
    ifconfig_path = '/sbin'
    if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
    if_down_cmd = 'ifconfig eth0:0 down'
    arping_path = '/usr/sbin'           # arping command path
    arping_cmd = 'arping -U $_IP_$ -w 1'
    clear_memqcache_on_escalation = on
    wd_escalation_command = ''
    wd_lifecheck_method = 'heartbeat'
    wd_interval = 10
    wd_heartbeat_port = 9694
    wd_heartbeat_keepalive = 2
    wd_heartbeat_deadtime = 30
    heartbeat_destination0 = 'node1'
    heartbeat_destination_port0 = 9694
    heartbeat_device0 = 'eth0'
    wd_life_point = 3
    wd_lifecheck_query = 'SELECT 1'
    wd_lifecheck_dbname = 'template1'
    wd_lifecheck_user = 'nobody'
    wd_lifecheck_password = ''
    other_pgpool_hostname0 = 'node1'
    other_pgpool_port0 = 9999
    other_wd_port0 = 9000
    relcache_expire = 0
    relcache_size = 256
    check_temp_table = on
    memory_cache_enabled = off
    memqcache_method = 'shmem'
    memqcache_memcached_host = 'localhost'
    memqcache_memcached_port = 11211
    memqcache_total_size = 67108864
    memqcache_max_num_cache = 1000000
    memqcache_expire = 0
    memqcache_auto_cache_invalidation = on
    memqcache_maxcache = 409600
    memqcache_cache_block_size = 1048576
    memqcache_oiddir = '/var/log/pgpool/oiddir'
    white_memqcache_table_list = ''
    black_memqcache_table_list = ''

    failover_stream.sh文件内容

    #! /bin/sh

    # Failover command for streaming replication.

    # This script assumes that DB node 0 is primary, and 1 is standby.

    #

    # If standby goes down, do nothing. If primary goes down, create a

    # trigger file so that standby takes over primary node.

    #

    # Arguments: $1: failed node id. $2: new master hostname. $3: path to

    # trigger file.

     

    failed_node=$1

    new_master=$2

    trigger_file=$3

    # Do nothing if standby goes down.

    #if [ $failed_node = 1 ]; then

    #        exit 0;

    #fi

    /usr/bin/ssh -T $new_master /bin/touch $trigger_file

    exit 0;

    主节点配置

    cd /opt/pgpool/etc

    cp pool_hba.conf.sample pool_hba.conf

    vim pool_hba.conf

    host    all             all           192.168.2.4/32        trust

    host    replication     replica       192.168.2.4/32        trust

    host    postgres        postgres      192.168.2.4/32        trust

    host    all             all           192.168.100.3/32      trust

    host    replication     replica       192.168.100.3/32      trust

    host    postgres        postgres      192.168.100.3/32      trust

    host    postgres        postgres      192.168.100.3/32      trust

    host    all             all           192.168.100.4/32      trust

    host    replication     replica       192.168.100.4/32      trust

    host    postgres        postgres      192.168.100.4/32      trust

    host    postgres        postgres      192.168.100.4/32      trust

    备节点配置

    cd /opt/pgpool/etc

    cp pool_hba.conf.sample pool_hba.conf

    vim pool_hba.conf

    host    all             all           192.168.2.4/32        trust

    host    replication     replica       192.168.2.4/32        trust

    host    postgres        postgres      192.168.2.4/32        trust

    host    all             all           192.168.100.3/32      trust

    host    replication     replica       192.168.100.3/32      trust

    host    postgres        postgres      192.168.100.3/32      trust

    host    postgres        postgres      192.168.100.3/32      trust

    host    all             all           192.168.100.4/32      trust

    host    replication     replica       192.168.100.4/32      trust

    host    postgres        postgres      192.168.100.4/32      trust

    host    postgres        postgres      192.168.100.4/32      trust

    配置密码文件(两节点操作)

    su – postgres

    psql

    select rolname,rolpassword from pg_authid;

    vim pool_passwd

    postgres:postgres的md5密码

    rolname:rolpassword

    pgpool启动:pgpool –n &

    pgpool关闭:pgpool –m fast stop

    连接pgpool:psql –h node (or IP) –p 9999 –U postgres –d postgres

    查看pgpool集群中nodes的状态

    show pool_nodes;

    十七、安装keepalived-1.2.15(主备两节点操作)

    下载keepalived-1.2.15到/opt/sotf_bak

    tar zxvf keepalived-1.2.15.tar.gz

    cd keepalived-1.2.15

    ./configure

    make

    make install

    node1 keepalived.conf 文件内容

     

    global_defs {

       notification_email {

         acassen@firewall.loc

         failover@firewall.loc

         sysadmin@firewall.loc

       }

       notification_email_from Alexandre.Cassen@firewall.loc

       smtp_server 127.0.0.1

       smtp_connect_timeout 30

       router_id LVS_DEVEL

    }

    vrrp_script chk_pgpool {

            script "killall -0 pgpool"

            interval 3

            weight 2

    }

    vrrp_instance VI_1 {

        state MASTER

        interface eth0

        virtual_router_id 51

        priority 100

        advert_int 1

        authentication {

            auth_type PASS

            auth_pass 1111

        }

        virtual_ipaddress {

            192.168.100.4

        }

             track_script {

            chk_pgpool

    }

    }

    node2 keepalived.conf 文件内容

    global_defs {

       notification_email {

         acassen@firewall.loc

         failover@firewall.loc

         sysadmin@firewall.loc

       }

       notification_email_from Alexandre.Cassen@firewall.loc

       smtp_server 127.0.0.1

       smtp_connect_timeout 30

       router_id LVS_DEVEL

    }

    vrrp_script chk_pgpool {

            script "killall -0 pgpool"

            interval 3

            weight 2

    }

    vrrp_instance VI_1 {

        state BACKUP

        interface eth0

        virtual_router_id 51

        priority 99

        advert_int 1

        authentication {

            auth_type PASS

            auth_pass 1111

        }

        virtual_ipaddress {

            192.168.100.4

        }

            track_script {

            chk_pgpool

    }

    }

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  • 原文地址:https://www.cnblogs.com/songyuejie/p/4561089.html
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