AWS Elastic Beanstalk的ebextensions配置在EC2扩容新实例时不生效如何解决

你当前配置仅在手动触发应用部署时执行container_commands，新扩容的EC2实例虽然会拉取相同的应用包，但存在三个核心问题导致配置不生效：

1. 未配置supervisor、beanstalkd的开机自启规则，实例启动后服务不会自动运行
2. setup.sh中使用相对路径读取配置文件，新实例初始化阶段执行脚本时路径不匹配
3. 未给setup.sh配置执行权限，部分场景下脚本会因权限不足执行失败

1. 调整supervisor.config配置 #

新增systemd服务注册规则、脚本权限配置，修改后内容如下：

files:
  /etc/systemd/system/supervisord.service:
    mode: "000644"
    owner: root
    group: root
    content: |
      [Unit]
      Description=Supervisor daemon
      After=network.target

      [Service]
      Type=forking
      ExecStart=/usr/bin/supervisord -c /etc/supervisor/supervisord.conf
      ExecStop=/usr/bin/supervisorctl shutdown
      ExecReload=/usr/bin/supervisorctl reload
      KillMode=process
      Restart=on-failure
      RestartSec=42s

      [Install]
      WantedBy=multi-user.target

container_commands:
  00_chmod_setup:
    command: "chmod +x .ebextensions/supervisor/setup.sh"
  01_install_supervisor:
    command: ".ebextensions/supervisor/setup.sh"

2. 调整setup.sh脚本 #

修正路径问题，新增服务开机自启配置，修改后内容如下：

#!/bin/bash
# 先切换到EB部署阶段的应用临时目录，解决相对路径问题
cd /var/app/staging || exit 1

echo "Supervisor - starting setup"
. /opt/elasticbeanstalk/deployment/env

if [ ! -f /usr/bin/supervisord ]; then
    echo "installing supervisor"
    easy_install supervisor
else
    echo "supervisor already installed"
fi

if [ ! -d /etc/supervisor ]; then
    mkdir /etc/supervisor
    echo "create supervisor directory"
fi

if [ ! -d /etc/supervisor/conf.d ]; then
    mkdir /etc/supervisor/conf.d
    echo "create supervisor configs directory"
fi

cat .ebextensions/supervisor/supervisord.conf > /etc/supervisor/supervisord.conf
cat .ebextensions/supervisor/supervisord.conf > /etc/supervisord.conf
cat .ebextensions/supervisor/supervisor_laravel.conf > /etc/supervisor/conf.d/supervisor_laravel.conf

# 重载systemd配置，识别新增的supervisord服务
systemctl daemon-reload
if systemctl is-active --quiet supervisord; then
    echo "supervisor is running, reloading config"
    supervisorctl reread
    supervisorctl update
else
    echo "starting supervisor"
    systemctl start supervisord
fi

# 配置supervisor开机自启
systemctl enable supervisord
echo "Supervisor Running!"

yum -y install http://cbs.centos.org/kojifiles/packages/beanstalkd/1.9/3.el7/x86_64/beanstalkd-1.9-3.el7.x86_64.rpm

if systemctl is-active --quiet beanstalkd; then
    echo "beanstalkd is running"
else
    echo "starting beanstalkd"
    systemctl start beanstalkd.service
fi
# 配置beanstalkd开机自启
systemctl enable beanstalkd
echo "Beanstalkd Running..."

将修改后的配置提交到代码仓库，重新打包部署到Elastic Beanstalk即可。后续新扩容的实例会自动执行全部配置，无需手动操作。

内容的提问来源于stack exchange，提问作者fakhruddin tahery