docker启动一个nginx容器，加-V启动不起来，不加就可以正常启动。

排除了内存问题（内存够用），然后查看日志

docker logs ID

$ sudo docker logs cda

/docker-entrypoint.sh: /docker-entrypoint.d/ is not empty, will attempt to perform configuration

/docker-entrypoint.sh: Looking for shell scripts in /docker-entrypoint.d/

/docker-entrypoint.sh: Launching /docker-entrypoint.d/10-listen-on-ipv6-by-default.sh

10-listen-on-ipv6-by-default.sh: info: Getting the checksum of /etc/nginx/conf.d/default.conf

10-listen-on-ipv6-by-default.sh: info: /etc/nginx/conf.d/default.conf differs from the packaged version

/docker-entrypoint.sh: Launching /docker-entrypoint.d/20-envsubst-on-templates.sh

/docker-entrypoint.sh: Launching /docker-entrypoint.d/30-tune-worker-processes.sh

/docker-entrypoint.sh: Configuration complete; ready for start up

2022/10/20 08:38:38 [emerg] 1#1: unexpected "}" in /etc/nginx/conf.d/default.conf:15

nginx: [emerg] unexpected "}" in /etc/nginx/conf.d/default.conf:15

原来是配置文件写错了，启动脚本是没有问题的。

编辑配置文件，发现nginx配置文件少了一个；号，nginx执行出错所以退出了容器

修改配置文件后，启动成功。