背景

在架设国民认证服务的时候，国民认证厂家程式码是基于 Redis Cluster + tomcat + mysql 部署，因考虑到开发环境，我们要求快速部署、快速开发，所以，我考虑用 docker-compose 进行部署。

根据 Redis官网 的提示，为了让 Docker 与 Redis Cluster 兼容，需要使用 Docker 的 host 网路模式

环境

Docker version 19.03.8

docker-compose version 1.28.5

程式码如下：

version: "3.8"

services:
  redis-6371: # 服务名称
    image: redis # 创建容器时所需的镜像
    container_name: redis-6371 # 容器名称
    restart: always # 容器总是重新启动
    network_mode: "host" # host 网络模式
    volumes: # 数据卷，目录挂载
      - /data/docker-redis/redis-cluster/6371/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6371/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf # 覆盖容器启动后默认执行的命令

  redis-6372:
    image: redis
    container_name: redis-6372
    network_mode: "host"
    volumes:
      - /data/docker-redis/redis-cluster/6372/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6372/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf

  redis-6373:
    image: redis
    container_name: redis-6373
    network_mode: "host"
    volumes:
      - /data/docker-redis/redis-cluster/6373/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6373/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf

  redis-6374:
    image: redis
    container_name: redis-6374
    network_mode: "host"
    volumes:
      - /data/docker-redis/redis-cluster/6374/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6374/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf

  redis-6375:
    image: redis
    container_name: redis-6375
    network_mode: "host"
    volumes:
      - /data/docker-redis/redis-cluster/6375/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6375/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf

  redis-6376:
    image: redis
    container_name: redis-6376
    network_mode: "host"
    volumes:
      - /data/docker-redis/redis-cluster/6376/conf/redis.conf:/etc/redis/redis.conf
      - /data/docker-redis/redis-cluster/6376/data:/data
      - /etc/localtime:/etc/localtime:ro
    command: redis-server /etc/redis/redis.conf


  mysql:
    restart: always
    image: mysql:5.7.21
    container_name: FIDO_mysql

    ports:
      - 3306:3306

    environment:
      TZ: Asia/Shanghai
      MYSQL_ROOT_PASSWORD: Admin123

    volumes:
      - /data/FIDO/mysql/mysql.conf.d:/etc/mysql/mysql.conf.d
      - /data/FIDO/mysql/lib/mysql:/var/lib/mysql
      - /etc/localtime:/etc/localtime:ro
      - /data/FIDO/mysql/logs:/logs

  tomcat:
    restart: always
    image: tomcat:8.5
    container_name: FIDO_tomcat

    ports:
      - 8081:8080

    volumes:
      - /data/FIDO/tomcat/webapps:/usr/local/tomcat/webapps
      - /data/FIDO/tomcat/conf/context.xml:/usr/local/tomcat/conf/context.xml
      - /data/FIDO/tomcat/logs:/usr/local/tomcat/logs
      - /etc/localtime:/etc/localtime:ro
    links:
      - mysql:FIDO_mysql

现象

问题分析

第一个警告:

• WARNING: The TCP backlog setting of 511 cannot be enforced because /proc/sys/net/core/somaxconn is set to the lower value of 128

第二个警告:

• WARNING: 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.

第三个警告:

• WARNING 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.

解决办法

# 1.输入以下命令
[root@localhost ~]# echo "net.core.somaxconn = 511" >> /etc/sysctl.conf
[root@localhost ~]# echo "vm.overcommit_memory = 1" >> /etc/sysctl.conf
[root@localhost ~]# sysctl -p
[root@localhost ~]# echo "echo never > /sys/kernel/mm/transparent_hugepage/enabled" >> /etc/rc.local
[root@localhost ~]# source /etc/rc.local
# 2.启动 Redis 服务