我想在 docker 运行期间将 JSON 文件的内容作为环境变量传递。 docker run 在 systemd 服务文件中初始化。

我做了类似的事情:

export TEMP_CONFIG=$(cat /etc/config.json)

docker run \
        --env SERVICE_NAME=${CONTAINER_NAME} \
        --env TEMP_CONFIG \

root@ip-10-109-7-77:/usr/local/nginx/conf# echo ${TEMP_CONFIG}

root@ip-10-109-7-77:/usr/local/nginx/conf#

--env TEMP_CONFIG=$(cat /etc/config.json) \ 

docker: Error parsing reference: "\"conf\"" is not a valid repository/tag.

{
    "conf" :
    {
        "appname" :
        {
            "dbhost" : "xxxx",
            "dbname" : "dbname",
            "dbuser" : "user",
            "dbpassword" : "xxxxx",
            "hostname" : "xxxxxx"
        },
        "cacheBaseDir" : "/storage/",
        "iccprofile" : "/etc/nginx/RGB.V1.0.icc",
        "tmpDir" : "/tmp",
        "mdb" :
        {
            "user" : "user",
            "password" : "xxxxx",
            "rights" : "GlobalAdministrator",
            "company" : "somecompany"
        }
    }
}

最佳答案

更新答案

您提到您使用 docker run systemd 单元文件中的命令。一个系统 ExecStart options 不是在 shell 中启动的。名称支持环境变量替换。另见 the documentation对此:

Basic environment variable substitution is supported. Use "${FOO}" as part of a word, or as a word of its own, on the command line, in which case it will be replaced by the value of the environment variable including all whitespace it contains, resulting in a single argument.

This syntax is intended to be very similar to shell syntax, but only the meta-characters and expansions described in the following paragraphs are understood. Specifically, redirection using "<", "<<", ">", and ">>", pipes using "|", running programs in the background using "&", and other elements of shell syntax are not supported. [...] Note that shell command lines are not directly supported.

ExecStart=/bin/bash -c "docker run -e \"TEMP_CONFIG=$(</etc/config.json)\" ..."

--env TEMP_CONFIG={ "conf" : { "...

--env "TEMP_CONFIG=$(cat /etc/config.json)"

--env "TEMP_CONFIG=$(</etc/config.json)"

https://stackoverflow.com/questions/42444021/