CentOS 7下Docker部署Redis与PostgreSQL实战指南

1. 项目概述在CentOS 7环境下搭建Docker容器平台并部署Redis和PostgreSQL数据库是当前企业级应用开发的标配环境。这套技术栈结合了容器化的便捷性和高性能数据库的优势特别适合需要快速迭代的互联网应用场景。我最近在客户现场部署了一套生产环境发现很多工程师对这三个组件的协同安装存在困惑。本文将分享我在CentOS 7.9系统上的完整安装实录包含从系统准备到服务调优的全流程以及实际部署中遇到的典型问题解决方案。2. 环境准备与基础配置2.1 系统初始化检查首先确认系统版本和内核符合Docker运行要求cat /etc/redhat-release # 确认是CentOS 7.x uname -r # 内核版本需≥3.10重要提示如果使用云服务器请先检查虚拟化支持egrep --color vmx|svm /proc/cpuinfo若无输出则需要联系云厂商开启虚拟化支持2.2 配置阿里云YUM源替换默认源提升软件下载速度sudo yum install -y wget sudo wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo sudo yum makecache2.3 关闭SELinux和防火墙避免权限问题导致容器异常sudo setenforce 0 sudo sed -i s/SELINUXenforcing/SELINUXdisabled/g /etc/selinux/config sudo systemctl stop firewalld sudo systemctl disable firewalld3. Docker安装与配置3.1 安装Docker CE官方推荐安装方式sudo yum install -y yum-utils device-mapper-persistent-data lvm2 sudo yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo sudo yum install -y docker-ce docker-ce-cli containerd.io3.2 配置镜像加速创建或修改daemon.jsonsudo mkdir -p /etc/docker sudo tee /etc/docker/daemon.json -EOF { registry-mirrors: [https://registry.docker-cn.com], exec-opts: [native.cgroupdriversystemd], log-driver: json-file, log-opts: { max-size: 100m } } EOF3.3 启动并验证Dockersudo systemctl start docker sudo systemctl enable docker docker --version docker run hello-world # 测试基础功能4. Redis容器化部署4.1 拉取官方镜像推荐使用带alpine标签的轻量版docker pull redis:6-alpine4.2 创建持久化数据目录mkdir -p /data/redis/{data,conf} chmod -R 777 /data/redis4.3 自定义配置文件创建redis.confcat /data/redis/conf/redis.conf EOF bind 0.0.0.0 protected-mode no port 6379 tcp-backlog 511 timeout 0 tcp-keepalive 300 daemonize no supervised no pidfile /var/run/redis_6379.pid loglevel notice logfile databases 16 save 900 1 save 300 10 save 60 10000 stop-writes-on-bgsave-error yes rdbcompression yes rdbchecksum yes dbfilename dump.rdb dir /data EOF4.4 启动Redis容器docker run -d --name redis \ -p 6379:6379 \ -v /data/redis/data:/data \ -v /data/redis/conf/redis.conf:/usr/local/etc/redis/redis.conf \ --restart always \ redis:6-alpine redis-server /usr/local/etc/redis/redis.conf4.5 连接测试docker exec -it redis redis-cli INFO SERVER5. PostgreSQL容器化部署5.1 拉取官方镜像docker pull postgres:13-alpine5.2 创建数据目录mkdir -p /data/pgsql/{data,conf,backup} chmod -R 777 /data/pgsql5.3 启动PostgreSQLdocker run -d --name pgsql \ -p 5432:5432 \ -e POSTGRES_PASSWORDyourpassword \ -e PGDATA/var/lib/postgresql/data/pgdata \ -v /data/pgsql/data:/var/lib/postgresql/data \ -v /data/pgsql/backup:/backup \ --restart always \ postgres:13-alpine5.4 基础配置优化进入容器修改配置docker exec -it pgsql bash vi /var/lib/postgresql/data/pgdata/postgresql.conf建议修改的关键参数max_connections 200 shared_buffers 256MB effective_cache_size 768MB maintenance_work_mem 64MB checkpoint_completion_target 0.9 wal_buffers 16MB default_statistics_target 100 random_page_cost 1.1 effective_io_concurrency 200 work_mem 4MB6. 常见问题排查6.1 Docker启动失败症状Failed to start docker.service: Unit not found解决方案sudo yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine sudo rm -rf /var/lib/docker sudo yum install -y docker-ce docker-ce-cli containerd.io6.2 Redis连接超时检查项确认redis.conf中bind 0.0.0.0检查防火墙状态systemctl status firewalld测试端口连通性telnet 服务器IP 63796.3 PostgreSQL认证失败修改pg_hba.confhost all all 0.0.0.0/0 md5然后重启容器docker restart pgsql7. 性能调优建议7.1 Docker层面优化限制容器内存使用docker update --memory 1g --memory-swap -1 redis配置日志轮转sudo tee /etc/docker/daemon.json -EOF { log-driver: json-file, log-opts: { max-size: 10m, max-file: 3 } } EOF7.2 Redis生产配置建议启用持久化appendonly yes appendfsync everysec设置最大内存maxmemory 2gb maxmemory-policy allkeys-lru7.3 PostgreSQL生产建议定期维护docker exec pgsql pg_dumpall -U postgres /backup/full_backup.sql监控慢查询log_min_duration_statement 1000 log_statement none