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tech:centos7-redis

CentOS7 安裝 Redis5

  • CentOS7 from PVE6 CT-template
  • 因為 EPEL 的 redis 版本只到 3 , 發現透過 IUS repo 可以安裝版本 4 或 5

安裝與啟動程序

  • 安裝
    yum install -y https://repo.ius.io/ius-release-el7.rpm
    yum install redis5
  • 啟動
    systemctl enable redis
    systemctl start redis
  • 檢查 redis 服務版本狀態
    redis-cli info server

    呈現結果如下:

    # Server
    redis_version:5.0.9
    redis_git_sha1:00000000
    redis_git_dirty:0
    redis_build_id:977de8e50f63afe8
    redis_mode:standalone
    os:Linux 3.10.0-1127.13.1.el7.x86_64 x86_64
    arch_bits:64
    multiplexing_api:epoll
    atomicvar_api:atomic-builtin
    gcc_version:4.8.5
    process_id:1869
    run_id:e0ff9930e953b9fd6fcc9cb155402a79751539e8
    tcp_port:6379
    uptime_in_seconds:50
    uptime_in_days:0
    hz:10
    configured_hz:10
    lru_clock:16610448
    executable:/usr/bin/redis-server
    config_file:/etc/redis.conf
    

啟動時 redis.log 出現以下需要修正的事項
  1. The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128. 修正語法
    vi /etc/sysctl.conf
    :
    net.core.somaxconn=1024
  2. overcommit_memory is set to 0! Background save may fail under low memory condition. To fix this issue add 'vm.overcommit_memory = 1' to /etc/sysctl.conf and then reboot or run the command 'sysctl vm.overcommit_memory=1' for this to take effect. 修正語法
    vi /etc/sysctl.conf
    :
    vm.overcommit_memory=1
  3. you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled. 修正語法
    vi /etc/rc.d/rc.local
    :
    echo never > /sys/kernel/mm/transparent_hugepage/enabled
    chmod a+x /etc/rc.d/rc.local
  4. 重新開機讓設定生效
  • 觀察 redis 服務運作狀態(使用記憶體/連結數..)
    redis-cli --stat

    顯示訊息大概會如下

    ------- data ------ --------------------- load -------------------- - child -
    keys       mem      clients blocked requests            connections
    505        1.35M    1       0       8 (+0)              2
    505        1.35M    1       0       9 (+1)              2
    505        1.35M    1       0       10 (+1)             2
    505        1.35M    1       0       11 (+1)             2
    505        1.35M    1       0       12 (+1)             2
    522        1.83M    2       0       135 (+123)          3
    954        2.87M    2       0       1400 (+1265)        3
    961        2.92M    3       0       1486 (+86)          4
    961        2.92M    3       0       1487 (+1)           4
    961        2.94M    4       0       1530 (+43)          5
    961        2.96M    5       0       1573 (+43)          6
    961        2.96M    5       0       1574 (+1)           6
    963        3.06M    6       0       2120 (+546)         7
    1060       3.43M    7       0       2530 (+410)         8
    1060       3.43M    7       0       2531 (+1)           8
    1060       3.49M    8       0       2583 (+52)          9
    1060       3.45M    8       0       2601 (+18)          9
    1060       3.45M    8       0       2645 (+44)          9
    1060       3.45M    8       0       2689 (+44)          9
    1060       3.45M    8       0       2690 (+1)           9
    

  • 參考應用 : Wordpress Plugin - W3 Total Cache
    • 需要安裝 php-redis 套件
      yum install php-redis

      Dependencies Resolved
      
      =============================================================================================================================================================================================================================================
       Package                                                      Arch                                              Version                                                          Repository                                             Size
      =============================================================================================================================================================================================================================================
      Installing:
       php-pecl-redis5                                              x86_64                                            5.3.0-1.el7.remi.7.3                                             remi-php73                                            239 k
      Installing for dependencies:
       liblzf                                                       x86_64                                            3.6-7.el7                                                        epel                                                   22 k
       libzstd                                                      x86_64                                            1.4.5-3.el7                                                      epel                                                  331 k
       php-pecl-igbinary                                            x86_64                                            3.1.2-1.el7.remi.7.3                                             remi-php73                                             99 k
       php-pecl-msgpack                                             x86_64                                            2.1.0-1.el7.remi.7.3                                             remi-php73                                             58 k
      
      Transaction Summary
      =============================================================================================================================================================================================================================================
      Install  1 Package (+4 Dependent packages)
      

參考網址

tech/centos7-redis.txt · 上一次變更: 2020/07/03 09:20 由 jonathan_tsai