Contents
Can Docker containers load kernel modules?
Containers interact with the kernel through system calls and don’t include any part of the kernel or the kernel modules inside the container. This is one of the reasons why containers designed to be light weight and portable. Falco is an example of a container that loads a kernel module as part of its start process.
How do I list loaded kernel modules?
Module Commands
- depmod – handle dependency descriptions for loadable kernel modules.
- insmod – install loadable kernel module.
- lsmod – list loaded modules.
- modinfo – display information about a kernel module.
- modprobe – high level handling of loadable modules.
- rmmod – unload loadable modules.
Where are kernel modules stored?
Loadable kernel modules in Linux are loaded (and unloaded) by the modprobe command. They are located in /lib/modules or /usr/lib/modules and have had the extension . ko (“kernel object”) since version 2.6 (previous versions used the .o extension).
Does Docker use host kernel?
2 Answers. Docker never uses a different kernel: the kernel is always your host kernel. If your host kernel is “compatible enough” with the software in the container you want to run it will work; otherwise it won’t.
Do you need to verify your Linux kernel for Docker?
When you’re using Docker and Containers on a modern Linux system or on a public cloud offering, this has been already optimized by the Linux distribution or your cloud provider. But when you start using Containers on Embedded Devices you should verify this carefully.
How to verify your Linux kernel for container compatibility?
For example, if you want to use Docker Swarm mode you have to know that CONFIG_IPVLANis mandatory – this kernel can’t run Swarm mode correctly! For “Storage Drivers” you can typically ignore the missing settings for aufsand zfsas long as you don’t required to use these, same is true for devicemapper.
Where can I find the kernel config file?
The kernel .config is a readable configuration file which is used to compile a new Linux kernel. Typically it will get embedded into your new kernel and therefore you can read it from the running kernel. It’s available as a file at /proc/config.gzin a compressed form, so we have to use zcatto extract the .config file in clear text.