Docker之WARNING: IPv4 forwarding is disabled. Networking will not work（虚拟机配置网络异常：IPv4）解决方案

装完了Docker，然后启动镜像，发现没有网络，而且不能ifconfig，因网桥配置完后，需要开启转发，不然容器启动后，就会没有网络，配置/etc/sysctl.conf,添加net.ipv4.ip_forward=1即可，操作如下：

配置转发
vim /etc/sysctl.conf

#配置转发
net.ipv4.ip_forward=1

#重启服务，让配置生效
systemctl restart network

#查看是否成功,如果返回为“net.ipv4.ip_forward = 1”则表示成功

sysctl net.ipv4.ip_forward

vim /etc/sysctl.conf#配置转发
net.ipv4.ip_forward=1#重启服务，让配置生效
systemctl restart network#查看是否成功,如果返回为“net.ipv4.ip_forward = 1”则表示成功sysctl net.ipv4.ip_forward

检查容器是否正常访问网络
#重启docker服务
service docker restart

#查看运行过的容器
docker ps -a

#启动gitlab 容器
docker start gitblab2

#进入gitlab容器
docker attach gitlab2

#试试获取百度信息看是否成功
curl baidu.com

#重启docker服务
service docker restart #查看运行过的容器
docker ps -a#启动gitlab 容器
docker start gitblab2 #进入gitlab容器
docker attach gitlab2#获取百度信息
curl baidu.com

完美

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Docker之WARNING: IPv4 forwarding is disabled. Networking will not work（虚拟机配置网络异常：IPv4）解决方案

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