I WANT TO CONNECT FROM A CONTAINER TO A SERVICE ON THE HOST

by

The host has a changing IP address (or none if you have no network access). From 18.03 onwards our recommendation is to connect to the special DNS name host.docker.internal, which resolves to the internal IP address used by the host. This is for development purpose and will not work in a production environment outside of Docker Desktop for Mac.

The gateway is also reachable as gateway.docker.internal.

link: https://docs.docker.com/docker-for-mac/networking/

docker制作镜像 apt-get 安装文件报错debconf: unable to initialize frontend: Dialog

by

docker在制作镜像时，抛出异常:

debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype
dpkg-preconfigure: unable to re-open stdin:

原因是因为在使用apt-get安装依赖时并非静默安装，需要交互，所以无法正常通过。

解决方法,在docker file中增加一句：

ENV DEBIAN_FRONTEND noninteractive

link: https://blog.csdn.net/a19891024/article/details/78250967

Install zsh-completions for Mac OS X Catalina

by

Additional completion definitions for Zsh

brew install zsh-completions

To activate these completions, add the following to your .zshrc:

fpath=(/usr/local/share/zsh-completions $fpath)
plugins=(… zsh-completions)
autoload -U compinit && compinit

You may also need to force rebuild `zcompdump`:

  rm -f ~/.zcompdump; compinit

Additionally, if you receive “zsh compinit: insecure directories” warnings when attempting to load these completions, you may need to run this:

chmod go-w '/usr/local/share'

docker pull unknown blob

by

在腾讯云服务器中使用腾讯的容器服务，拉取腾讯云仓库中的镜像时，会出现如下的报错：

docker pull ccr.ccs.tencentyun.com/qcloud/nginx:1.9
Trying to pull repository ccr.ccs.tencentyun.com/qcloud/nginx ... 
1.9: Pulling from ccr.ccs.tencentyun.com/qcloud/nginx
51f5c6a04d83: Pulling fs layer 
a3ed95caeb02: Pulling fs layer 
640c8f3d0eb2: Downloading 
a4335300aa89: Waiting 
unknown blob

出现这种问题一般是dns解析问题或者https认证等问题。

dns的问题手动添加hosts即可，https问题添加如下配置到/etc/default/docker 即可：

DOCKER_OPTS="--insecure-registry ccr.ccs.tencentyun.com"

重启docker服务

systemctl restart  docker.service

重启完之后，即可正常拉取。

docker pull ccr.ccs.tencentyun.com/qcloud/nginx:1.9
Trying to pull repository ccr.ccs.tencentyun.com/qcloud/nginx ... 
1.9: Pulling from ccr.ccs.tencentyun.com/qcloud/nginx
51f5c6a04d83: Pull complete 
a3ed95caeb02: Pull complete 
640c8f3d0eb2: Pull complete 
a4335300aa89: Pull complete 
Digest: sha256:311e9840c68d889e74eefa18227d0a6f995bc7a74f5453fdcd49fe3c334feb24
Status: Downloaded newer image for ccr.ccs.tencentyun.com/qcloud/nginx:1.9