要監控mysql server狀態
安裝role
ansible-galaxy install cloudalchemy.mysqld_exporter
透過ansible安裝mysqld exporter
playbook.yml
- hosts: all
become: true
roles:
- role: cloudalchemy.mysqld_exporter
mysqld_exporter_dsn: "user:password@(dbHost:3306)/"
mysqld_exporter_web_listen_address: "0.0.0.0:9104"
參考連結
https://github.com/cloudalchemy/ansible-mysqld_exporter/blob/master/defaults/main.yml
1.由command line傳送變數給ansible
command:
ansible-playbook -i hosts.yml --extra-vars "a=2 b=3" tasks/xxx.yml
ansible-playbook -i hosts.yml -e "a=2 b=3" tasks/xxx.yml
ansible:
tasks:
- name: add folder
file:
state: directory
path: '{{a}}'
2.由ansible command line傳送陣列變數給ansible
以json傳遞
command:
ansible-playbook -i hosts.yml --extra-vars "{'myitems':[1,2,3]}" tasks/xxx.yml
ansible:
loop: {{myitems}}
tasks:
- name: add loop folder
file:
state: directory
path: '{{item}}'
3.由command line傳送變數給docker-compose
ex:
command:
port=12345 docker-compose up -d
docker-compose:
ports:
- ${api_port}:12345
4.由command line傳送變數給ansible再傳給docker-compose
ex:
command:
ansible-playbook -i hosts.yml --extra-vars "api_port=12345" tasks/ansible.yml
ansible.yml:
tasks:
- name: Shell Start node-api-server
shell:
cmd: 'port={{api_port}} docker-compose --compatibility up -d'
docker-compose.yml:
ports:
- ${api_port}:12345
原本mongo+mongo-express運作相當穩定
後來掛掉 透過docker logs察看到一個錯誤
MongoError: command listDatabases requires authentication
需要驗證
在docker-compose.yml上加上設定ME_CONFIG_MONGODB_URL解決
ex: docker-compose.yml
mongo-express:
image: mongo-express:latest
container_name: mongo_admin
restart: always
ports:
- 8081:8081
environment:
ME_CONFIG_MONGODB_ADMINUSERNAME: 帳號
ME_CONFIG_MONGODB_ADMINPASSWORD: 設定密碼
ME_CONFIG_SITE_BASEURL: /mongo
ME_CONFIG_MONGODB_URL: "mongodb://帳號:密碼@mongo—container名稱:27017/"
實際場域遇到一個狀況
在Window Server運行node api server
發生node吃掉100%cpu 而讓系統無法回應
將node api server以docker佈署到Linux主機上
希望可以限制每個continainer的資源
限制可使用的cpu與記憶體
佈署docker container是透過ansible執行
ansible設定docker-compose的cpu限制 在3.x版後就不支援了
只能透過docker執行
要透過docker-compose執行 只能透過shell執行
安裝
1.docker-compose.yml
node-api-server:
image: node:12.22.7-alpine3.14
container_name: node-api-server
working_dir: /usr/src/NODE_API_SERVER/bin
restart: always
command: >
sh -c 'node index'
volumes:
- '/home/vagrant/project_pools:/usr/src/'
ports:
- 12345:12345
- 9229:9229
deploy:
resources:
limits:
cpus: '0.40'
memory: '300M'
2.ansible 安裝檔 install.yml
tasks
- name: build docker
become: true
docker_compose:
project_src: 'docker-comose檔案所在的目錄'
3.ansible 執行檔start.yml
tasks:
- name: Shell Start node-api-server
shell:
cmd: docker-compose --compatibility up -d
chdir: 'docker-comose檔案所在的目錄'
參考
