在 Rancher 中升级容器，同一个镜像地址，环境变量有容器已被替换，有容器未被替换的分析解决

1、进入环境变量已被替换的容器，某个配置文件，符合预期。如图1

图1

2、进入环境变量未被替换的容器，某个配置文件，不符合预期。如图2

图2

3、查看环境变量已被替换的容器的日志。有相应环境变量已被替换的提示。如图3

图3

2020/8/11 下午3:03:11 PCS_CFG_NGINX_SERVER_NAME=pcs.wjtest.chinamcloud.cn
2020/8/11 下午3:03:11 PCS_CFG_API_HOST_INFO=http://pcsapi.wjtest.chinamcloud.cn
2020/8/11 下午3:03:11 PCS_CFG_API_BASE_URL=/v1
2020/8/11 下午3:03:11 PCS_CFG_CALLBACK_LOGIN=http://cmcgroup.wjtest.chinamcloud.cn/login/index?call_back=http://pcs.wjtest.chinamcloud.cn/#/topic/add
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_URL=https://cmcconsole.wjtest.chinamcloud.cn
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_HEADER_LEFT_CSS=/cmc/cmc_header_left.css
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_HEADER_LEFT_JS=/cmc/cmc_header_left.js
2020/8/11 下午3:03:11 PCS_CFG_YS_FLAG=申请任务
2020/8/11 下午3:03:11 PCS_CFG_BQ_FLAG=0
2020/8/11 下午3:03:11 PCS_CFG_NGINX_SERVER_NAME replace pcs.wjtest.chinamcloud.cn -> /etc/nginx/conf.d/pcs.conf
2020/8/11 下午3:03:11 PCS_CFG_API_HOST_INFO replace http://pcsapi.wjtest.chinamcloud.cn -> /etc/nginx/conf.d/pcs.conf
2020/8/11 下午3:03:11 PCS_CFG_API_BASE_URL replace /v1 -> /etc/nginx/conf.d/pcs.conf
2020/8/11 下午3:03:11 sed: -e expression #1, char 120: unknown option to `s'
2020/8/11 下午3:03:11 PCS_CFG_CALLBACK_LOGIN replace http://cmcgroup.wjtest.chinamcloud.cn/login/index?call_back=http://pcs.wjtest.chinamcloud.cn/#/topic/add -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_URL replace https://cmcconsole.wjtest.chinamcloud.cn -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_HEADER_LEFT_CSS replace /cmc/cmc_header_left.css -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 PCS_CFG_CMC_CONSOLE_HEADER_LEFT_JS replace /cmc/cmc_header_left.js -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 PCS_CFG_YS_FLAG replace 申请任务 -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 PCS_CFG_BQ_FLAG replace 0 -> /mcloud/www/pcs/build/config.js
2020/8/11 下午3:03:11 /config/init/cronlog.sh: line 4: LOG_NAME: unbound variable

4、查看环境变量未被替换的容器的日志。无相应环境变量已被替换的提示。且报错：Invalid Date Invalid Date grabbing logs: EOF。即无效的日期 获取日志：EOF。如图4

图4

Invalid Date Invalid Date grabbing logs: EOF

5、查看环境变量未被替换的容器，升级(Upgrade) – 命令(Command) – 入口(Entry Point)：/bin/bash。而查看环境变量已被替换的容器，其值为空。其作用为配置容器启动后执行的命令。如图5

图5

6、编辑环境变量未被替换的容器，升级(Upgrade) – 命令(Command) – 入口(Entry Point)：。设置其值为空。重新升级。容器的日志未再报错，环境变量已被替换。此时，容器启动后执行的命令脚本为：/config/bootstrap.sh。此脚本中包含环境变量替换的实现。

#!/bin/bash
localedef -i en_US -f UTF-8 en_US.UTF-8
set -e
set -u

# Supervisord default params
SUPERVISOR_PARAMS='-c /etc/supervisord.conf'


# Create directories for supervisor's UNIX socket and logs (which might be missing
# as container might start with /data mounted from another data-container).
mkdir -p /data/conf /data/run /data/logs
chmod 711 /data/conf /data/run /data/logs

if [ "$(ls /config/init/)" ]; then
  for init in /config/init/*.sh; do
    . $init
  done
fi


# We have TTY, so probably an interactive container...
if test -t 0; then
  # Run supervisord detached...
  supervisord $SUPERVISOR_PARAMS

  # Some command(s) has been passed to container? Execute them and exit.
  # No commands provided? Run bash.
  if [[ $@ ]]; then
    eval $@
  else
    export PS1='[/u@/h : /w]/$ '
    /bin/bash
  fi

# Detached mode? Run supervisord in foreground, which will stay until container is stopped.
else
  # If some extra params were passed, execute them before.
  # @TODO It is a bit confusing that the passed command runs *before* supervisord,
  #       while in interactive mode they run *after* supervisor.
  #       Not sure about that, but maybe when any command is passed to container,
  #       it should be executed *always* after supervisord? And when the command ends,
  #       container exits as well.
  if [[ $@ ]]; then
    eval $@
  fi
  supervisord -n $SUPERVISOR_PARAMS
fi