Automatically load kernel module overlayfs operation at CentOS startup

To automatically load kernel modules in CentOS, you can add a script in the /etc/sysconfig/modules/ directory and load the required modules in this script.

Here is a script called overlayfs.modules that I use to automatically load the overlayfs module in my CentOS 7.X:

#!/bin/sh

/sbin/modinfo -F filename overlayfs> /dev/null 2>&1
if [ $? -eq 0 ]; then
 /sbin/modprobe overlayfs
fi

The script first checks whether the overlayfs module file exists. If so, it calls the /sbin/modprobe command to load this module.

Place this file in the /etc/sysconfig/modules/ directory and give it executable permissions. This way, the module will be automatically loaded the next time you restart the system.

Additional knowledge: Centos7 automatically loads module ko when booting

Suppose there is a kernel module file named c1004.ko

1. First copy the compiled module to the kernel device directory

sudo cp c1004.ko /lib/modules/$(uname -r)/kernel/drivers/

2. Create a module startup file

sudo cat > /etc/modules-load.d/c1004.conf <<EOF
# Load c1004.ko at boot
c1004
EOF

3. Update the module and restart

sudo depmod

reboot

4. After restarting, check whether the module has been installed normally

lsmod |grep c1004

# Output similar to the following indicates that the auto-start is OK
c1004 30081 0

If an error occurs when running insmod c1004.ko, you need to recompile the driver file.

Uninstall the driver rmmod c1004

The above article about automatically loading kernel module overlayfs when CentOS starts is all I want to share with you. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM.