Docker FAQ

Docker only maps ports to IPv6 but not to IPv4

Start a docker service and only display the ipv6 port information. IPv4 has no port information, which makes it impossible to access the service externally through IPv4, and reports a Connection refused error

Workaround

Disable ipv6 on the server

vim /etc/default/grub

Add ipv6.disable=1 in line 6

GRUB_CMDLINE_LINUX="ipv6.disable=1 crashkernel=auto spectre_v2=retpoline rd.lvm.lv=centos/root rd.lvm.lv=centos/swap rhgb quiet"

Reconfigure grub and restart the server

grub2-mkconfig -o /boot/grub2/grub.cfg
reboot

WARNING: bridge-nf-call-iptables is disabled

WARNING: bridge-nf-call-iptables is disabled
WARNING: bridge-nf-call-ip6tables is disabled

Workaround

vim /etc/sysctl.conf

# Add the following two lines net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1

# Then make it effective sysctl -p /etc/sysctl.conf

# Verify docker info

Docker Acceleration

Recommend using Alibaba Cloud Docker to accelerate

Usage process: https://cr.console.aliyun.com/cn-hangzhou/instances/repositories

Find the image accelerator

sudo mkdir -p /etc/docker
sudo tee /etc/docker/daemon.json <<-'EOF'
{
 "registry-mirrors": ["https://sziho4ql.mirror.aliyuncs.com"]
}
EOF
sudo systemctl daemon-reload
sudo systemctl restart docker

The above is the detailed content of solving common Docker problems. For more information about solving Docker problems, please pay attention to other related articles on 123WORDPRESS.COM!