如何使用AWS Elastic Beanstalk运行工作程序?
我正在AWS Elastic beantalk上启动django应用程序。我想运行后台任务或工作者以便运行celery。
我找不到是否可能。如果是,如何实现?
这是我现在正在做的事情,但这每次都会产生一个事件类型错误。
container_commands: 01_syncdb:
command: "django-admin.py syncdb --noinput"
leader_only: true
50_sqs_email:
command: "./manage.py celery worker --loglevel=info"
leader_only: true
回答:
正如@ chris-wheadon在其评论中建议的那样,你应该尝试在后台将Celery作为恶魔运行。AWS Elastic Beanstalk 已使用supervisor运行某些守护进程。因此,你可以利用它来运行celeryd并避免为此创建自定义AMI。它对我很好。
我要做的是在EB将应用程序部署到实例之后,以编程方式将celeryd配置文件添加到实例。棘手的部分是,该文件需要设置守护进程所需的环境变量(例如,如果你在应用程序中使用S3或其他服务,则需要使用AWS访问密钥)。
下面是我使用的脚本的副本,将此脚本添加到.ebextensions
配置EB环境的文件夹中。
安装脚本会在文件/opt/elasticbeanstalk/hooks/appdeploy/post/
夹(文档)中创建一个文件,该文件位于所有EB实例上。部署后将执行其中的任何shell脚本。放置在那里的shell脚本的工作方式如下:
- 在
celeryenv
变量中,virutalenv环境以遵循监督符号的格式存储。这是逗号分隔的env变量列表。 - 然后,脚本创建一个变量
celeryconf
,该变量将配置文件包含为字符串,其中包括先前解析的env变量。 - 然后将此变量通过管道传递到
celeryd.confcelery
守护程序的受监管配置文件中。 - 最后,将新创建的配置文件的路径添加到主
supervisord.con
f文件(如果尚未存在)。这是脚本的副本:
files: "/opt/elasticbeanstalk/hooks/appdeploy/post/run_supervised_celeryd.sh":
mode: "000755"
owner: root
group: root
content: |
#!/usr/bin/env bash
# Get django environment variables
celeryenv=`cat /opt/python/current/env | tr '\n' ',' | sed 's/export //g' | sed 's/$PATH/%(ENV_PATH)s/g' | sed 's/$PYTHONPATH//g' | sed 's/$LD_LIBRARY_PATH//g'`
celeryenv=${celeryenv%?}
# Create celery configuraiton script
celeryconf="[program:celeryd]
; Set full path to celery program if using virtualenv
command=/opt/python/run/venv/bin/celery worker -A myappname --loglevel=INFO
directory=/opt/python/current/app
user=nobody
numprocs=1
stdout_logfile=/var/log/celery-worker.log
stderr_logfile=/var/log/celery-worker.log
autostart=true
autorestart=true
startsecs=10
; Need to wait for currently executing tasks to finish at shutdown.
; Increase this if you have very long running tasks.
stopwaitsecs = 600
; When resorting to send SIGKILL to the program to terminate it
; send SIGKILL to its whole process group instead,
; taking care of its children as well.
killasgroup=true
; if rabbitmq is supervised, set its priority higher
; so it starts first
priority=998
environment=$celeryenv"
# Create the celery supervisord conf script
echo "$celeryconf" | tee /opt/python/etc/celery.conf
# Add configuration script to supervisord conf (if not there already)
if ! grep -Fxq "[include]" /opt/python/etc/supervisord.conf
then
echo "[include]" | tee -a /opt/python/etc/supervisord.conf
echo "files: celery.conf" | tee -a /opt/python/etc/supervisord.conf
fi
# Reread the supervisord config
supervisorctl -c /opt/python/etc/supervisord.conf reread
# Update supervisord in cache without restarting all services
supervisorctl -c /opt/python/etc/supervisord.conf update
# Start/Restart celeryd through supervisord
supervisorctl -c /opt/python/etc/supervisord.conf restart celeryd
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