Step‑by‑Step Guide to Install Docker, Nginx, and Jenkins on CentOS

Install and configure Docker

1. Replace yum source if not already using a domestic mirror.

curl -fsSL "https://gitee.com/clay-wangzhi/shell/raw/master/repo_replace.sh" | bash

2. Install Docker using the official script.

curl -fsSL "https://get.docker.com/" | bash -s -- --mirror Aliyun

Load br_netfilter module. modprobe br_netfilter Set kernel parameters.

cat <<EOF > /etc/sysctl.d/docker.conf
# iptables should not process bridge traffic
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-arptables = 1
# enable forwarding
net.ipv4.ip_forward = 1
EOF
sysctl -p /etc/sysctl.d/docker.conf

⚠️ Use sysctl --system with caution; parameters in different files have priority, with /etc/sysctl.conf taking highest precedence.

Configure Docker image accelerator.

curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io

Enable and start Docker service.

systemctl enable docker && systemctl start docker

Install and configure Nginx

1. Add Nginx yum repository by creating /etc/yum.repos.d/nginx.repo with the following content:

[nginx-stable]
name=nginx stable repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true

[nginx-mainline]
name=nginx mainline repo
baseurl=http://nginx.org/packages/mainline/centos/$releasever/$basearch/
gpgcheck=1
enabled=0
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true

2. Install and start Nginx.

yum -y install nginx
nginx

3. Add host resolution entry.

echo "127.0.0.1 www.google.com" >> /etc/hosts

Install and configure Jenkins

⚠️ Before this step, Nginx must be installed. When Docker runs with --network=host , updating the host's /etc/hosts does not affect the container's hosts file (Docker 20.10.6).

1. Pull Jenkins image. docker pull jenkinsci/blueocean:1.24.6 2. Create data directory. mkdir -p /opt/jenkins-data 3. Run Jenkins container with host network and bind mount.

docker run -u root --rm -d -e JAVA_OPTS=-Duser.timezone=Asia/Shanghai --mount type=bind,source=/opt/jenkins-data,target=/var/jenkins_home --network=host --name jenkins jenkinsci/blueocean:1.24.6

4. Follow on‑screen prompts to finish setup. If the Jenkins instance appears offline after entering the password, two workarounds are available:

Change the plugin update site URL to a domestic mirror (e.g., http://mirror.esuni.jp/jenkins/updates/update-center.json) via /pluginManager/advanced, then restart Jenkins.

Edit /var/lib/jenkins/updates/default.json and set connectionCheckUrl to an accessible address.

Both methods may not guarantee 100 % success; the first only changes the download source check, and the second may be overwritten by Jenkins.

Since connectionCheckUrl is only used to verify network reachability for plugins, a simple solution is to map www.google.com to the local machine and let Nginx respond.