wait-for-it

在执行命令之前等待服务可用。

wait-for-it是一个脚本，它会在执行用户定义的命令之前等待一个或多个TCP服务（即host:port）的可用性。它对于同步启动相互依赖的服务非常有用，例如连接的docker容器。

从v2.0.0版本开始，wait-for-it将返回执行命令的退出码。

查看wait-for-it文档

安装

$ pip install wait-for-it

演示

用法

Usage: wait-for-it [OPTIONS] [COMMANDS]...

  Wait for service(s) to be available before executing a command.

Options:
  -h, --help               Show this message and exit.
  -v, --version            Show the version and exit.
  -q, --quiet              Do not output any status messages
  -p, --parallel           Test services in parallel rather than in serial
  -t, --timeout seconds    Timeout in seconds, 0 for no timeout  [default: 15]
  -s, --service host:port  Services to test, in one of the formats: ':port',
                           'hostname:port', 'v4addr:port', '[v6addr]:port' or
                           'https://...'

示例

测试我们是否可以访问www.google.com上的端口80，如果可用，则输出消息google is up

$ wait-for-it \
--service www.google.com:80 \
-- echo "google is up"

[*] Waiting 15 seconds for www.google.com:80
[+] www.google.com:80 is available after 0 seconds
google is up

您可以使用-t或--timeout选项设置自己的超时时间。将超时值设置为0将禁用超时

$ wait-for-it \
--service www.google.com:80 \
--timeout 0 \
-- echo "google is up"

[*] Waiting for www.google.com:80 without a timeout
[+] www.google.com:80 is available after 0 seconds
google is up

可以通过添加额外的-s或--service选项来测试多个服务

$ wait-for-it \
--service www.google.com:80 \
--service www.bing.com:80 \
--service www.duckduckgo.com:80 \
-- echo "google, bing, and duckduckgo are up"

[*] Waiting 15 seconds for www.google.com:80
[+] www.google.com:80 is available after 0 seconds
[*] Waiting 15 seconds for www.bing.com:80
[+] www.bing.com:80 is available after 0 seconds
[*] Waiting 15 seconds for www.duckduckgo.com:80
[+] www.duckduckgo.com:80 is available after 0 seconds
google, bing, and duckduckgo are up

通过添加-p或--parallel选项，wait-for-it可以在并行而不是串行中执行相同的操作

$ wait-for-it \
--parallel \
--service www.google.com:80 \
--service www.bing.com:80 \
--service www.duckduckgo.com:80 \
-- echo "google, bing, and duckduckgo are up"

[*] Waiting 15 seconds for www.bing.com:80
[*] Waiting 15 seconds for www.duckduckgo.com:80
[*] Waiting 15 seconds for www.google.com:80
[+] www.bing.com:80 is available after 0 seconds
[+] www.duckduckgo.com:80 is available after 0 seconds
[+] www.google.com:80 is available after 0 seconds
google, bing, and duckduckgo are up

可以使用-q或--quiet选项来抑制状态消息输出

$ wait-for-it \
--quiet \
--service www.google.com:80 \
-- echo "google is up"

google is up

相关

• vishnubob/wait-for-it

许可

MIT © Travis Clarke, Sebastian Pipping