86 lines
2.4 KiB
Plaintext
86 lines
2.4 KiB
Plaintext
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= Linux kernel =
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The part actually called Linux. Some stuff on compiling for it and things it
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provides
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== Proc ==
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/proc is a virtual filesystem provided by the kernel that has info on processes
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running and some basic system info. Here are some useful things from it.
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* meminfo
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- info about ram usage
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* acpi/*
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- info about things that control power (such as laptop lid, power button, etc)
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* sys/kernel/*
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- info about the status of the kernel
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* crypto
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- encryption algorithms built into the kernel
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* uptime
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- system uptime
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* fs/*
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- all supported filesystems
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== Dev ==
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The device virtual file system, located at /dev. Each device is a file and can
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be talked to here. Here is some useful info from it
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* random
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- random data
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* urandom
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- less predictable random data
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* zero
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- outputs nothing
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* tty*
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- All of the different virual terminals
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* cpu/*
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- All cpu cores
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* snd/*
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- All sound devices
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* usb/*
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- USB devices
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* disk/*
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- All available disks, can be viewed by uuid, partlabel, and more
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* mapper/*
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- Where LVM partitions are mounted, including encrypted partitions and drives
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== Updating the kernel ==
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First be sure to mount the boot parition to /boot
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Next copy your .config from the source directory of your previous kernel to
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somewhere safe
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For gentoo, you'll need to switch your /usr/src/linux symlink using eselect now
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Now begins the commands
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1) make mrproper
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- make clean with no additional atrtifacts
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2) cp /path/to/kernel/config .config
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- Install old config file
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3) make olddefconfig
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- copy over old config options to new kernel config
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4) make modules_prepare
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- Prepare kernel modules on system
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5) make -jX
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- make the kernel! replace X with number of desired threads
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6) make modules_install && make install
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- install the new kernel and modules
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7) (Gentoo) emerge @module-rebuild
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- Recompile kernel modules to work with the new kenel
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8) (Encrypted root only) genkernel --luks --lvm --kernel-config=/path/to/kernel/config initramfs
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- If not on gentoo use distros initramfs build tool. splash adds a splash
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screen and is not required
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9) (Optional) Clean up all kernels
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- Go ahead and remove all references in /boot to an older kernel. DO NOT
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delete the current kernel, you may need it in case installing this kernel
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fails!
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10) grub-mkconfig -o /boot/grub/grub.cfg
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- Let grub update its config to know that the new kernel exists
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11) reboot
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- reboot and hope it worked!
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[[index]]
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