1. Configure the domestic source for docker installation, and report an error HTTP Error 404 - Not Found
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Reason: When configuring the domestic mirror source, the address was wrongly written, resulting in the prompt HTTP Error 404 after installing docker
Solution:
1) Go to the /etc/yum.repos.d directory
cd /etc/yum.repos.d ll
2) Delete all docker-related repo files, including the wrong Alibaba Cloud image just added
rm -rf docker-ce.repo rm -rf mirrors.aliyun.com_docker-.repo
3) After deleting, re-install the docker as follows
yum -y update yum install -y yum-utils yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo yum install -y docker-ce docker-ce-cli containerd.io
2. Install docker error Requires:container-selinux>=2:2.74
Solution: install the latest contain-selinux
wget -O /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo yum install epel-release -y yum install container-selinux -y
3. On the cloud server, docker pulls the mysql image very slowly, and it still fails for more than half an hour
Reason: The default source of docker is the official source abroad, and the download speed may be slow.
Solution: change the docker image source to a domestic source
Alibaba cloud server solution:
1. Enter the Alibaba Cloud server console https://account.aliyun.com/ , search for mirroring, and click Container Mirroring Service to enter
2) Enter Mirroring Center - Mirroring Accelerator, select the operating system corresponding to the cloud server, and complete the operation according to the commands in the operation document.
sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF' { "registry-mirrors":["https://4zh3lxhh.mirror.aliyuncs.com"] } EOF
sudo systemctl daemon-reload
sudo systemctl restart docker
3) After the configuration is complete, go to pull the image again, it is normal.
Tencent cloud server solution:
Same as Alibaba Cloud server solution
1) Open the /etc/docker/daemon.json configuration file
vim /etc/docker/daemon.json
2) Enter the keyboard i to enter the editor, add the following content, and press the Esc key to exit the edit, enter: wq to save and exit
{ "registry-mirrors": ["https://mirror.ccs.tencentyun.com"] }
3) Restart docker, and then perform image pull operation, it will be normal.
sudo systemctl restart docker
Commonly used images to choose from are as follows:
USTC: https://docker.mirrors.ustc.edu.cn/
Netease: https://hub-mirror.c.163.com/
Qiniu Cloud Accelerator: https://reg-mirror.qiniu.com
Alibaba Cloud: <your ID>.mirror.aliyuncs.com
Tencent Cloud: https://mirror.ccs.tencentyun.com
4. Enter the docker container and display bash-4.2#
Reason: The two files .bashrc and .bash_profile are missing in the root directory of the current login user of the docker container
Solution:
These two files are in the /etc/skel directory, you only need to copy these two files to /root to solve it.
bash-4.2# cp /etc/skel/.bashrc /root/ bash-4.2# cp /etc/skel/.bash_profile /root/
5. When entering the docker container, the displayed time zone is wrong
The default time in docker is UTC time, and the server system is CST East Eight District time, separated by 8 hours.
Solution:
1) Enter the container, and write the time zone you want to set in the /etc/localtime file through the soft link command ln -s, such as Shanghai time zone
docker exec -it [container name or container ID] /bin/bash // enter the container in interactive mode ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime exit
2) Restart the container
docker restart [container name or container ID] // restart the container
6. The mysql container on the cloud server cannot be connected using navicat
Solution:
1. First confirm whether the corresponding mysql container has been started
2. Confirm the correctness of the connected host ip, port, user name, and password
3. After confirming all the above, if you can’t connect, please confirm whether the port of the cloud server is open
3.1 Alibaba Cloud Open Port Steps:
- Log in to the Alibaba Cloud console--select the cloud server you purchased--more--network and security group--security group configuration
- Click Configuration Rules - Inbound Direction, copy an item, add the externally mapped port of the mysql container, for example 3307, click Save
3.2 Tencent Cloud Open Port Steps:
- Log in to the Tencent Cloud console--find the purchased server--firewall--add rules
- Create a new rule, add the externally mapped port of the mysql container, and click OK
