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Docker 安装与优化:生产环境实战指南(包含离线安装)

Docker 安装与优化:生产环境实战指南(包含离线安装)

Docker 安装与优化:生产环境实战指南

本教程参考 Docker 官网安装编写 官网:https://docs.docker.com/

一、安装:选择正确的版本

适用系统:Ubuntu 20.04/22.04、CentOS 7/8、RHEL 8/9 等主流系统

1. 版本策略

生产环境务必使用 Docker CE Stable 版本,避免实验性功能:

2. 开始安装(Linux)

添加docker官方源并安装依赖

Ubuntu/Debian:

# 添加Docker官方GPG密钥sudo apt updatesudo apt install ca-certificates curlsudo install -m 0755 -d /etc/apt/keyringssudo curl -fsSL https://download.docker.com/linux/ubuntu/gpg -o /etc/apt/keyrings/docker.ascsudo chmod a+r /etc/apt/keyrings/docker.asc# 将存储库添加到Apt源sudo tee /etc/apt/sources.list.d/docker.sources <<EOFTypes: debURIs: https://download.docker.com/linux/ubuntuSuites: $(. /etc/os-release && echo"${UBUNTU_CODENAME:-$VERSION_CODENAME}")Components: stableSigned-By: /etc/apt/keyrings/docker.ascEOF

安装 docker

安装最新版本

sudo apt install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

安装特定版本

apt list --all-versions docker-cedocker-ce/noble 5:29.2.1-1~ubuntu.24.04~noble <arch>docker-ce/noble 5:29.2.0-1~ubuntu.24.04~noble <arch>...

选择版本安装

VERSION_STRING=5:29.2.1-1~ubuntu.24.04~noblesudo apt install docker-ce=$VERSION_STRING docker-ce-cli=$VERSION_STRING containerd.io docker-buildx-plugin docker-compose-plugin

CentOS/RHEL:

配置docker源

# 低版本系统用yum安装也可以dnf -y install dnf-plugins-corednf config-manager --add-repo https://download.docker.com/linux/rhel/docker-ce.repo

安装最新版本

dnf install docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin

安装指定版本

## 先列出存储库中可用的版本dnf list docker-ce --showduplicates | sort -rdocker-ce.x86_64    3:29.2.1-1.el9    docker-ce-stabledocker-ce.x86_64    3:29.2.0-1.el9    docker-ce-stable<...>

选择需要安装的版本

VERSION_STRING=docker-ce-3:29.2.1-1.el9dnf install docker-ce-<VERSION_STRING> docker-ce-cli-<VERSION_STRING> containerd.io docker-buildx-plugin docker-compose-plugin

二、核心优化:生产环境必做

1. 守护进程配置(/etc/docker/daemon.json

{"exec-opts": ["native.cgroupdriver=systemd"],"log-driver""json-file","log-opts": {"max-size""100m","max-file""5"  },"storage-driver""overlay2","storage-opts": ["overlay2.override_kernel_check=true"  ],"live-restore"true,"max-concurrent-downloads"10,"max-concurrent-uploads"5,"default-ulimits": {"nofile": {"Name""nofile","Hard"64000,"Soft"64000    }  },"metrics-addr""0.0.0.0:9323","experimental"false}

关键参数说明:

  • "exec-opts": ["native.cgroupdriver=systemd"] :指定容器使用的 systemd  驱动
  • "log-driver": "json-file":控制容器 stdout/stderr 的存储方式
  • log-opts:防止日志无限增长,到100m就切割
  • storage-driver: 存储驱动
  • storage-opts:跳过内核兼容性检查,强制运行在不支持 overlay2 的内核上
  • live-restore:Docker daemon 重启时容器不退出
  • max-concurrent-downloads:控制镜像 layer 并发下载数,默认是 3
  • max-concurrent-uploads :push 镜像时并发上传层数
  • default-ulimits:资源限制,为所有容器设置默认 ulimit
  • metrics-addr:监控接口

应用配置:

systemctl daemon-reloadsystemctl restart docker

2. 网络优化

自定义网桥避免IP冲突:

# 创建生产级网络docker network create \  --driver bridge \  --subnet=172.20.0.0/16 \  --gateway=172.20.0.1 \  --opt "com.docker.network.bridge.name"="br0" \  --opt "com.docker.network.bridge.enable_ip_masquerade"="true" \  --opt "com.docker.network.bridge.enable_icc"="true" \  prod-network

内核参数调优(/etc/sysctl.conf):

# conntrack(容器/NAT核心)net.netfilter.nf_conntrack_max = 1048576net.netfilter.nf_conntrack_tcp_timeout_established = 600net.netfilter.nf_conntrack_tcp_timeout_time_wait = 30net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 30net.netfilter.nf_conntrack_tcp_timeout_close_wait = 15# 端口范围net.ipv4.ip_local_port_range = 1024 65535# TCP连接优化net.ipv4.tcp_tw_reuse = 1net.ipv4.tcp_fin_timeout = 30# 队列优化net.core.somaxconn = 4096net.core.netdev_max_backlog = 65536# buffer优化net.core.rmem_max = 16777216net.core.wmem_max = 16777216net.ipv4.tcp_rmem = 4096 87380 16777216net.ipv4.tcp_wmem = 4096 65536 16777216# keepalive(长连接稳定)net.ipv4.tcp_keepalive_time = 600net.ipv4.tcp_keepalive_intvl = 15net.ipv4.tcp_keepalive_probes = 5# SYN攻击防护net.ipv4.tcp_syncookies = 1net.ipv4.tcp_max_syn_backlog = 8192

3. 存储优化

Overlay2 性能调优:

# 使用独立高速磁盘(SSD/NVMe)sudo mkdir -p /data/dockersudo mount /dev/nvme1n1 /data/docker# 修改Docker根目录sudo systemctl edit docker.service# 添加:[Service]ExecStart=ExecStart=/usr/bin/dockerd --data-root /data/docker -H fd://sudo systemctl restart docker

三、安全加固

1. 最小权限原则

# 创建专用用户组,避免rootsudo groupadd dockersudo usermod -aG docker $USER# 限制容器能力(运行时)docker run -d \  --cap-drop=ALL \  --cap-add=NET_BIND_SERVICE \  --security-opt=no-new-privileges:true \  --read-only \  --tmpfs /tmp:noexec,nosuid,size=100m \  your-image

2. 镜像安全扫描

# 集成到CI/CDdocker scan your-image:latest# 或使用 Trivytrivy image --severity HIGH,CRITICAL your-image:latest

3. 资源限制(防止资源耗尽)

docker run -d \  --memory="512m" \  --memory-swap="512m" \  --cpus="1.0" \  --pids-limit=100 \  --restart=unless-stopped \  your-app

四、监控与排障

1. 关键指标采集

# 启用内置监控curl http://localhost:9323/metrics | grep engine_daemon# 推荐监控项:# - engine_daemon_container_states_containers{state="running"}# - engine_daemon_engine_cpus# - engine_daemon_engine_memory_bytes

2. 日志收集方案

# docker-compose 生产配置示例logging:driver:"fluentd"options:fluentd-address:localhost:24224tag:docker.{{.Name}}fluentd-async-connect:"true"

3. 快速排障命令

# 查看容器资源占用docker stats --no-stream# 查看事件流docker events --since 1h# 进入容器调试(推荐方式)docker exec -it <container> sh -c "export COLUMNS=300; export LINES=200; exec sh"# 导出容器文件系统docker export <container> -o /tmp/debug.tar

五、离线安装(一键安装脚本)

当前脚本需要联网下载 docker 离线安装包,修改一下就可以了。 

Docker 离线包下载地址:https://download.docker.com/linux/static/stable/      (根据自己系统架构下载)

注意事项:官方明确说明:

  • 二进制安装:
  • ❌ 不自动更新
  • ❌ 不适合生产
  • ❌ 无安全补丁自动修复

完整脚本:

#!/usr/bin/env bashset -e# ========================# 可配置参数# ========================DOCKER_VERSION="25.0.3"ARCH="x86_64"DOWNLOAD_URL="https://download.docker.com/linux/static/stable/${ARCH}/docker-${DOCKER_VERSION}.tgz"# ========================# 安装 Docker 二进制# ========================echo">>> 下载 Docker ${DOCKER_VERSION} ..."wget -c ${DOWNLOAD_URL} -O /tmp/docker.tgzecho">>> 解压 ..."tar -xzf /tmp/docker.tgz -C /tmpecho">>> 安装到 /usr/bin ..."cp /tmp/docker/* /usr/bin/# ========================# 创建必要目录# ========================echo">>> 创建目录 ..."mkdir -p /etc/dockermkdir -p /var/lib/docker# 创建 docker 组if ! getent group docker > /dev/null; then    groupadd dockerfi# (可选)允许当前用户无 sudo 使用 docker#  usermod -aG docker $USER || true# ========================# 创建 daemon.json(可选优化)# ========================cat > /etc/docker/daemon.json <<EOF{"exec-opts": ["native.cgroupdriver=systemd"],"log-driver""json-file","log-opts": {"max-size""100m","max-file""5"  },"storage-driver""overlay2","live-restore"true,"max-concurrent-downloads": 10,"max-concurrent-uploads": 5,"default-ulimits": {"nofile": {"Name""nofile","Hard": 64000,"Soft": 64000    }  },"metrics-addr""0.0.0.0:9323","experimental"false}EOF# ========================# 创建 containerd service# ========================cat > /etc/systemd/system/containerd.service <<EOF[Unit]Description=containerd container runtimeAfter=network.target[Service]ExecStart=/usr/bin/containerdRestart=alwaysDelegate=yesKillMode=processLimitNOFILE=1048576LimitNPROC=infinityLimitCORE=infinity[Install]WantedBy=multi-user.targetEOF# ========================# 创建 docker.service# ========================cat > /etc/systemd/system/docker.service <<EOF[Unit]Description=Docker Application Container EngineDocumentation=https://docs.docker.comAfter=network-online.target firewalld.service containerd.serviceWants=network-online.targetRequires=containerd.service[Service]Type=notifyExecStart=/usr/bin/dockerd \  --containerd=/run/containerd/containerd.sockExecReload=/bin/kill -s HUP \$MAINPIDTimeoutStartSec=0Restart=alwaysRestartSec=2LimitNOFILE=infinityLimitNPROC=infinityDelegate=yesKillMode=process[Install]WantedBy=multi-user.targetEOF# ========================# 启动服务# ========================echo">>> 重新加载 systemd ..."systemctl daemon-reexecsystemctl daemon-reloadecho">>> 启动 containerd ..."systemctl enable --now containerdecho">>> 启动 docker ..."systemctl enable --now docker# ========================# 验证安装# ========================echo">>> 验证 Docker ..."docker version || truedocker info || trueecho">>> 测试 hello-world ..."docker run hello-worldecho">>> 安装完成 ✅"

最后

作为容器技术的核心,Docker的配置优化直接决定了生产环境的稳定性和可靠性。记住一个原则:生产环境中,稳定性永远优先于功能性。 当然,容器技术的世界瞬息万变。如果您在实际部署中遇到特定场景的优化需求(比如K8s节点、CI/CD构建节点等),欢迎在评论区留言,我们一起探讨解决方案。

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  1. 请求信息 : 2026-04-01 15:27:54 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/482798.html
  2. 运行时间 : 0.110567s [ 吞吐率:9.04req/s ] 内存消耗:4,850.34kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=c4b48e9d6c73a7e5c6e51e66b804c81c
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  1. CONNECT:[ UseTime:0.000632s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000891s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000309s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000295s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000544s ]
  6. SELECT * FROM `set` [ RunTime:0.000211s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000699s ]
  8. SELECT * FROM `article` WHERE `id` = 482798 LIMIT 1 [ RunTime:0.000691s ]
  9. UPDATE `article` SET `lasttime` = 1775028474 WHERE `id` = 482798 [ RunTime:0.012494s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000507s ]
  11. SELECT * FROM `article` WHERE `id` < 482798 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000768s ]
  12. SELECT * FROM `article` WHERE `id` > 482798 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.005290s ]
  13. SELECT * FROM `article` WHERE `id` < 482798 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000977s ]
  14. SELECT * FROM `article` WHERE `id` < 482798 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001234s ]
  15. SELECT * FROM `article` WHERE `id` < 482798 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005445s ]
0.112353s