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Merge pull request #10 from obadz/swap-cleanup
Cleanup Swap files & add README.md
This commit is contained in:
Eric Litak
GitHub
commit
75342d0e38
2 changed files with 60 additions and 46 deletions
48
README.md
Normal file
48
README.md
Normal file
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@ -0,0 +1,48 @@
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This script aims to install NixOS on Digital Ocean droplets
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(starting from one of the distros that Digital Ocean supports out of the box)
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These are the only supported Digital Ocean images:
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- Fedora 24 x64
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- Ubuntu 16.04 x64
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- Debian 8.5 x64
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YMMV with any other hoster + image combination.
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nixos-infect is so named because of the high likelihood of rendering a system
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inoperable. Use with caution and preferably only on newly-provisioned
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systems.
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*WARNING NB*: This script wipes out the targeted host's root filesystem when it
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runs to completion. Any errors halt execution. It's advised to run with
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`bash -x` to help debug, as often a failed run leaves the system in an
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inconsistent state, requiring a rebuild (in DigitalOcean panel: Droplet
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Settings -> "Destroy" -> "Rebuild from original").
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*TO USE:*
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- Add any custom config you want (see notes below)
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- Deploy the droplet indicated at the top of the file, enable ipv6, add your ssh key
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- cat customConfig.optional nixos-infect | ssh root@targethost
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Alternatively, use the user data mechamism by supplying the lines between the following
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cat and EOF in the Digital Ocean Web UI (or HTTP API):
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```yaml
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#cloud-config
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runcmd:
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- curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | NIX_CHANNEL=nixos-16.09 bash 2>&1 | tee /tmp/infect.log
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```
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Potential tweaks:
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- `/etc/nixos/{,hardware-}configuration.nix`: rudimentary mostly static config
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- `/etc/nixos/networking.nix`, networking settings determined at runtime tweak
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if no ipv6, different number of adapters, etc.
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Motivation for this script: nixos-assimilate should supplant this script
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entirely, if it's ever completed. nixos-in-place was quite broken when I
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tried it, and also took a pretty janky approach that was substantially more
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complex than this (although it supported more platforms): it didn't install
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to root (/nixos instead), left dregs of the old filesystem (almost always
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unnecessary since starting from a fresh deployment), and most importantly,
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simply didn't work for me! (old system was being because grub wasnt properly
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reinstalled)
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58
nixos-infect
58
nixos-infect
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@ -1,49 +1,6 @@
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#! /usr/bin/env bash
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# These are the only supported Digital Ocean images:
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#
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# Fedora 24 x64
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# Ubuntu 16.04 x64
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# Debian 8.5 x64
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#
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# YMMV with any other hoster + image combination.
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# nixos-infect is so named because of the high likelihood of rendering a system
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# inoperable. Use with caution and preferably only on newly-provisioned
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# systems.
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#
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# WARNING NB This script wipes out the targeted host's root filesystem when it
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# runs to completion. Any errors halt execution. It's advised to run with
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# `bash -x` to help debug, as often a failed run leaves the system in an
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# inconsistent state, requiring a rebuild (in DigitalOcean panel: Droplet
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# Settings -> "Destroy" -> "Rebuild from original").
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#
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# TO USE:
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# - Add any custom config you want (see notes below)
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# - Deploy the droplet indicated at the top of the file, enable ipv6, add your ssh key
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# - cat customConfig.optional nixos-infect | ssh root@targethost
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#
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# Alternatively, use the user data mechamism by supplying the following lines (without >)
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# in the Digital Ocean Web UI (or HTTP API):
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#
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# > #cloud-config
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# >
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# > runcmd:
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# > - curl https://raw.githubusercontent.com/elitak/nixos-infect/master/nixos-infect | bash 2>&1 | tee /tmp/infect.log
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#
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# Potential tweaks:
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# /etc/nixos/{,hardware-}configuration.nix : rudimentary mostly static config
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# /etc/nixos/networking.nix, networking settings determined at runtime
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# tweak if no ipv6, different number of adapters, etc.
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#
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# Motivation for this script: nixos-assimilate should supplant this script
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# entirely, if it's ever completed. nixos-in-place was quite broken when I
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# tried it, and also took a pretty janky approach that was substantially more
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# complex than this (although it supported more platforms): it didn't install
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# to root (/nixos instead), left dregs of the old filesystem (almost always
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# unnecessary since starting from a fresh deployment), and most importantly,
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# simply didn't work for me! (old system was being because grub wasnt properly
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# reinstalled)
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# More info at: https://github.com/elitak/nixos-infect
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set -e -o pipefail
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@ -145,11 +102,19 @@ EOF
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makeSwap() {
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# TODO check currently available swapspace first
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swapFile=`mktemp`
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swapFile=`mktemp /tmp/nixos-infect.XXXXX.swp`
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dd if=/dev/zero of=$swapFile bs=1M count=$((1*1024))
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chmod 0600 $swapFile
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mkswap $swapFile
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swapon $swapFile
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swapon -v $swapFile
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}
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removeSwap() {
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for swapFile in /tmp/nixos-infect.*.swp
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do
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swapoff -v $swapFile
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rm -vf $swapFile
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done
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}
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prepareEnv() {
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@ -260,4 +225,5 @@ checkEnv
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makeConf
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makeSwap # smallest (512MB) droplet needs extra memory!
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infect
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removeSwap
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reboot
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