How to Deploy a Nacos Cluster with One Click Using Ansible?

Use Ansible to achieve one-click deployment of a 3-node Nacos cluster.

Definition of the hosts file

[root@localhost ansible]# cat inventory/hosts 
[all:vars]
# ansible_ssh_pass: Host password
# ansible_user: Host account

ansible_become=true
ansible_ssh_pass=123456
ansible_ssh_user=weihu
ansible_become_pass=123456
ansible_become_user=root
ansible_become_method=sudo

[nacos]
192.168.10.150 nacos_db_init=true
192.168.10.151
192.168.10.152

Definition of global variable file

[root@localhost ansible]# cat inventory/all.yml 
all:
    vars:     
        mysql_nacos_host: "192.168.10.128"
        mysql_nacos_port: "3306"
        mysql_nacos_db: "nacos"
        mysql_nacos_user: "nacos"
        mysql_nacos_passwd: "Rb992334%"

Definition of systemd service configuration file

[root@ansible ansible]# cat roles/nacos/files/nacos
cat: roles/nacos/files/nacos: No such file or directory
[root@ansible ansible]# cat roles/nacos/files/nacos
nacos-server-2.5.0.zip  nacos.service           
[root@ansible ansible]# cat roles/nacos/files/nacos.service 
[Unit]
Description=nacos
After=network.target

[Service]
Environment="JAVA_HOME=/usr/local/jdk1.8.0_202"
Type=forking
ExecStart=/opt/nacos/bin/startup.sh
ExecReload=/opt/nacos/bin/shutdown.sh
ExecStop=/opt/nacos/bin/shutdown.sh

[Install]
WantedBy=multi-user.target

Definition of cluster configuration file

[root@localhost ansible]# cat roles/nacos/templates/cluster.conf 
# ip:port
{{ play_hosts[0] }}:8848
{{ play_hosts[1] }}:8848
{{ play_hosts[2] }}:8848

Definition of application.properties file

The main task is to add support for MySQL data source configuration, including the URL, username, and password for the MySQL data source.

[root@localhost ansible]# cat roles/nacos/templates/application.properties 
......
 spring.sql.init.platform=mysql

### Count of DB:
 db.num=1

### Connect URL of DB:
 db.url.0=jdbc:mysql://{{ mysql_nacos_host }}:{{ mysql_nacos_port }}/{{ mysql_nacos_db }}?characterEncoding=utf8&connectTimeout=1000&socketTimeout=3000&autoReconnect=true&useUnicode=true&useSSL=false&serverTimezone=Asia/Shanghai
 db.user.0={{ mysql_nacos_user }}
 db.password.0={{ mysql_nacos_passwd }}
......

Database environment initialization configuration

Preparation of the MySQL database environment required for Nacos setup, database file initialization

[root@localhost ansible]# cat roles/nacos/tasks/nacos_db_init.yml 
---
- block:
    - name: Create Nacos database
      shell: |
        mysql -h{{ mysql_nacos_host }} -p{{ mysql_nacos_port }} -u{{ mysql_user }} -p{{ mysql_passwd }} -e "CREATE DATABASE IF NOT EXISTS {{ mysql_nacos_db }};"

    - name: Create Nacos user
      shell: |
        mysql -h{{ mysql_nacos_host }} -p{{ mysql_nacos_port }} -u{{ mysql_user }} -p{{ mysql_passwd }} -e "CREATE USER '{{ mysql_nacos_user }}'@'%' IDENTIFIED BY '{{ mysql_nacos_passwd }}';"

    - name: Grant all privileges on Nacos database to Nacos user
      shell: |
        mysql -h{{ mysql_nacos_host }} -p{{ mysql_nacos_port }} -u{{ mysql_user }} -p{{ mysql_passwd }} -e "GRANT ALL PRIVILEGES ON {{ mysql_nacos_db }}.* TO '{{ mysql_nacos_user }}'@'%';"

    - name: Flush privileges to apply changes
      shell: |
        mysql -h{{ mysql_nacos_host }} -p{{ mysql_nacos_port }} -u{{ mysql_user }} -p{{ mysql_passwd }} -e "FLUSH PRIVILEGES;"

    - name: Copy SQL schema file to target machine
      copy:
        src: mysql-schema.sql
        dest: /tmp/
        mode: '0644'

    - name: Import Nacos schema SQL file
      shell: |
        mysql -h{{ mysql_nacos_host }} -p{{ mysql_nacos_port }} -u{{ mysql_user }} -p{{ mysql_passwd }} {{ mysql_nacos_db }} < /tmp/mysql-schema.sql

  when: nacos_db_init is defined

Nacos cluster environment deployment installation

[root@localhost ansible]# cat roles/nacos/tasks/install.yml
---
- name: Distribute Nacos installation package to /opt directory
  copy:
    src: nacos-server-2.5.0.zip
    dest: /opt/
    
- name: Unzip Nacos installation package to /opt directory
  unarchive:
    src: /opt/nacos-server-2.5.0.zip
    dest: /opt
    remote_src: yes
    
- name: Distribute cluster configuration file cluster.conf
  template:
    src: cluster.conf
    dest: /opt/nacos/conf/
    mode: 0644

- name: Distribute configuration file application.properties
  template:
    src: application.properties
    dest: /opt/nacos/conf/
    mode: 0644

- name: Distribute systemd configuration file
  copy:
    src: nacos.service  
    dest: /usr/lib/systemd/system/
    mode: 0600

- name: Configure Nacos to start on boot
  systemd: 
    name: nacos
    enabled: yes
    daemon_reload: yes

- import_tasks: start.yml

Script execution

# Preparation of the MySQL database environment required for Nacos setup
ansible-playbook -i inventory/ -e operation=nacos_db_init nacos.yml
# Deployment of 3-node Nacos cluster environment
ansible-playbook -i inventory/ -e operation=install nacos.yml

Configuration check

# For the Nacos cluster, perform service start/stop and node status checks
ansible-playbook -i inventory/ -e operation=start|stop|status nacos.yml