CentOS 7.x docker uses overlay2 storage method

Edit /etc/docker/daemon.json and add the following:

{
 "storage-driver": "overlay2",
 "storage-opts": [
  "overlay2.override_kernel_check=true"
 ]
}

Installation dependencies:

yum install yum-plugin-ovl -y

Otherwise the following error will be reported:

May 05 18:20:45 node1 dockerd[49605]: Error starting daemon: error initializing graphdriver: /var/lib/docker contains several valid graphdrivers: overlay2, overlay; Please cleanup or explicitly choose storage driver (-s )

Finally restart Docker

systemctl restart docker

Additional knowledge: Compile and load toa module on centos7

1. Install the kernel-devel package, which needs to be consistent with the current kernel version

yum install kernel-devel

yum update kernel

2. After updating the kernel, you need to restart the system to make it take effect

3. Get toa source code

cd /usr/local/src/
git clone https://github.com/huaweicloud/elb-toa.git
cd elb-toa/src
make

4. If normal, toa.ko should be generated, load and test

insmod toa.ko

lsmod |grep toa

Deploy nginx for testing

Add boot auto-load

cd /lib/modules/uname -r/kernel/net/

cp /usr/local/src/elb-toa/src/toa.ko .

Add the following line to rc.local

insmod /lib/modules/3.10.0-957.21.3.el7.x86_64/kernel/net/toa.ko

Make sure /etc/rc.d/rc.local has execution permission, otherwise rc.local will not take effect.

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