FAQ：Docker和K8s部署常见问题汇总（持续更新）

FAQ1：centos 7 Docker容器启动报WARNING: IPv4 forwarding is disabled. Networking will not work

解决办法：

FAQ2：centos 7 Docker容器部署WordPress: Name or service not known in - on line 22

解决办法：

FAQ3：安装ETCD报错etcd.service lacks both ExecStart= and ExecStop= setting. Refusing.

解决办法：

FAQ4：K8s从节点报错The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决办法：

FAQ5：Error from server: error dialing backend: dial tcp 192.168.18.152:10250: getsockopt: no route to host

解决办法：

FAQ6：启动redis容器报错： er: Error response from daemon: driver failed programming external connectivity on endpoint redis (66aae97dab7868018a0fd139099dbc967028cf06f754b0d2cd1ee3fb49f10019): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 6379 -j DNAT --to-destination 172.17.0.2:6379 ! -i docker0: iptables: No chain/target/match by that name.

解决办法：

FAQ1：centos 7 Docker容器启动报WARNING: IPv4 forwarding is disabled. Networking will not work

解决办法：

# vi /etc/sysctl.conf 或者 # vi /usr/lib/sysctl.d/00-system.conf

添加如下代码： net.ipv4.ip_forward=1

重启network服务： # systemctl restart network

查看是否修改成功：# sysctl net.ipv4.ip_forward

如果返回为“net.ipv4.ip_forward = 1”则表示成功了

这时，重启容器即可。

另外还可以通过run时加-p 参数指定IP的方式来解决，比如 -p 0.0.0.0:999:999（指定ip就按ipv4来，否则默认全部是ipv6的。）

FAQ2：centos 7 Docker容器部署WordPress: Name or service not known in - on line 22

解决办法：

根因：数据库无法访问

解决方案1：重启php-fpm服务

service php-fpm restart
原文查看：https://stackoverflow.com/questions/2661546/php-network-getaddresses-getaddrinfo-failed-name-or-service-not-known

特别感谢：https://blog.csdn.net/qq_37500838/article/details/85008432#commentBox

解决方案2：配置dns解析为114.114.114.114

查看dns配置：cat /etc/resolv.conf

我用第一种方案就解决了，第二种方案暂时没有用，配置方法可网上查找

FAQ3：安装ETCD报错etcd.service lacks both ExecStart= and ExecStop= setting. Refusing.

解决办法：

ExecStart不能用“/”换行，前面最好用绝对路径的命令，比如：/bin/bash -c "command"。

更改之前：

更改之后：

FAQ4：K8s从节点报错The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决办法：

配置kubenetes的flannel网络的时候，出现以下报错

The connection to the server localhost:8080 was refused - did you specify the right host or port?

原因：kubenetes master没有与本机绑定，集群初始化的时候没有设置，kubectl命令需要使用kubernetes-admin来运行，解决方法如下，将主节点中的【/etc/kubernetes/admin.conf】文件拷贝到从节点相同目录下，然后配置环境变量：

echo "export KUBECONFIG=/etc/kubernetes/admin.conf" >> ~/.bash_profile

#立即生效：source ~/.bash_profile

FAQ5：Error from server: error dialing backend: dial tcp 192.168.18.152:10250: getsockopt: no route to host

The connection to the server localhost:8080 was refused - did you specify the right host or port?

解决办法：

FAQ6：启动redis容器报错： er: Error response from daemon: driver failed programming external connectivity on endpoint redis (66aae97dab7868018a0fd139099dbc967028cf06f754b0d2cd1ee3fb49f10019): (iptables failed: iptables --wait -t nat -A DOCKER -p tcp -d 0/0 --dport 6379 -j DNAT --to-destination 172.17.0.2:6379 ! -i docker0: iptables: No chain/target/match by that name.

解决办法：

方法一：重启 Docker ，重新启动容器，即可解决此问题。

FAQ7：centos

解决办法：