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徒弟的前端工程,已经构建出了镜像,并在1Panel上面可以查看镜像文件了。可是,手动创建容器运行后,怎么也连接不上。我带他准备先从容器里面的nginx是否已经启动正常开始,从内到外排查问题。
平时,如果是虚拟机或者远程服务器,我们一般都是连接远程桌面进去看看。现在是docker容器,怎么进到它里面呢?网上搜索的命令大多都是:
docker exec -it mine-vue /bin/bash
我去年初学时,也用过,确实是可以进入到容器里面的。可是今天就报了如下错误:
OCI runtime exec failed: exec failed: unable to start container process: exec: "/bin/bash": stat /bin/bash: no such file or directory: unknown
大概的意思是/bin/bash是不存在的。那我们怎么理解上面进入到容器的命令呢?我的理解是“mine-vue”是容器的名称,“/bin/bash”是连接通道或者软件。到这里失败了,于是我在1Panel里面找到了解决方法。
在1Panel的容器界面,每个容器都有“终端”这个选择,可以考虑直接点击打开,就应该能进入到容器里面了吧?
我这里有点懵,看到了似乎熟悉的东西“/bin/sh”,这个是啥?也是一种连接的程序?先点击“连接”看看吧。点击后,在这个界面下半部分,出现了连接的画面。我找到了"/bin"目录,发现下面确实有“ash”、“sh”,但是没有我们要的“bash”。
先还是解决我们的问题,最后再去延伸学习“bin”、“ash”、“sh”、“bash”。
我又回到了1Panel主机下面的终端,分别用“ash”和“sh”都进入查看了端口使用情况。
- [root@localhost ~]# docker exec -it mine-vue /bin/sh
- / # netstat -tunlp
- Active Internet connections (only servers)
- Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
- tcp 0 0 127.0.0.11:45675 0.0.0.0:* LISTEN -
- tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1/nginx: master pro
- tcp 0 0 :::80 :::* LISTEN 1/nginx: master pro
- udp 0 0 127.0.0.11:35984 0.0.0.0:* -
- / # exit
- [root@localhost ~]# docker exec -it mine-vue /bin/ash
- / # netstat -tunlp
- Active Internet connections (only servers)
- Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
- tcp 0 0 127.0.0.11:45675 0.0.0.0:* LISTEN -
- tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 1/nginx: master pro
- tcp 0 0 :::80 :::* LISTEN 1/nginx: master pro
- udp 0 0 127.0.0.11:35984 0.0.0.0:* -
- / # exit
- [root@localhost ~]#
发现端口都是正常监听的。那我在容器里面试试访问端口有正常的响应吗?输入了curl http://localhost:80,结果是正常的:
- / # curl http://localhost:80
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内部启动是正常的,服务也正常。外部访问不到,可能的问题是容器里面有防火墙,不让访问或者没有打开防火墙?docker容器跟主机的端口映射不对?测试访问时的地址有误?我能想到的就这些了。
修改端口映射配置,容器端口从8080修改为80,后面访问就正常了。
我们在浏览器访问http://10.1.230.94:14000/,发现就正常打开页面了。
回到为啥“docker exec -it mine-vue /bin/bash”进入不了容器?从1Pannel进入容器后,发现容器里面“bin”目录下面,根本没有“bash”程序,只有“ash”和“sh”。
问的AI哈,“/bin”一个非常关键的目录,它存放着系统最基本的命令的二进制可执行文件。这些命令是系统启动和进行系统管理时所需要的最基本的工具。我的理解就是windows的system目录。
也是问的AI,大概意思是都是不同的程序,他们都是命令行解释器(Shell)。
就是执行mine-vue容器里面的命令解释器,类似于运行了远程桌面,这里不过是命令形式的通道。当然你执行的话,只不过有几种命令解释器,需要我们选择一种。下次遇到没有“bash”时,可以试试“ash”和“sh”吧!
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