[CoreOS][docker]ついに自宅dockerサーバを構築した!!!!!!

Adachinですっ。

2013年から始まった自宅サーバ(実家)。
最初のブログとか見ると3年前の自分は非常に知識不足だったと改めて感じましたｗ(恥ずかしいレベル)
2015年から仮想コンテナ技術(docker)が発表され、インフラ構築方法も変わり始めました。
新時代の幕開けとしてインフラコンテナ技術を勉強しないとまずい!!
2016年AWSでlambdaが発表されサーバレスも流行りだし、
どんどん新技術には手を出さないとまずい!!

今回は新たなるチャレンジとして、大学時代に作った自作サーバ(windows/いろいろカスタマイズ)
をDockerサーバに転用したいなと今年の3月くらいに感じ、
2016/10/14金曜日に友人(くにしー)と構築したのでブログにまとめます。
用途としては問題なくサービスが運営できるか、検証機器としてです。

下記の画像では左上が現Adachin-Server-Lab(ブログ)が動いており、
右上が今回dockerサーバとなります。後ほどスペックなど紹介していきます。

■雑な自宅ネットワーク構成図(実家)

基本ルーターでポートを開放してあげてます。
セキュリティとしてdockerサーバには外部からログインできないよう、
adachin-serverを踏み台としてsshできるようにしました。
ここらへんはラズベリーパイをかましたいところ。

■dockerサーバスペック

・Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz/
仮想コア数も含めて8個
・メモリー10GB
・HDD 1TB

■CoreOSのインストール

CoreOSはdockerに特化されてて、デフォルトでdockerパッケージ系はすべてインストールされています。
CentOS7もサポートされてますが、せっかくなのでCoreOSでやりました。

https://coreos.com/os/docs/latest/booting-with-iso.html

とりあえずCoreOS自体容量少ない(136MB)ので、USBからマウントしてインストールしよう！
となりました。BIOSからUSBを優先度1にして起動してみたが、うまくいかなかった。。
ちなみにUSBではこんな作業をしてました。

Adachin-Air-11 > df -h

Filesystem Size Used Avail Capacity iused ifree %iused Mounted on

/dev/disk1 112Gi 86Gi 25Gi 78% 1868211 4293099068 0% /

devfs 191Ki 191Ki 0Bi 100% 660 0 100% /dev

map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net

map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home

/dev/disk3s1 29Gi 4.2Gi 25Gi 15% 137433 818199 14% /Volumes/VIRUS-USB

Adachin-Air-11 > diskutil unmountDisk /dev/disk3s1

Unmount of all volumes on disk3 was successful

[~/Desktop]

Adachin-Air-11 > df -h

Filesystem Size Used Avail Capacity iused ifree %iused Mounted on

/dev/disk1 112Gi 86Gi 25Gi 78% 1868226 4293099053 0% /

devfs 191Ki 191Ki 0Bi 100% 660 0 100% /dev

map -hosts 0Bi 0Bi 0Bi 100% 0 0 100% /net

map auto_home 0Bi 0Bi 0Bi 100% 0 0 100% /home

[~/Desktop]

Adachin-Air-11 > sudo dd if=/Users/adachin/Desktop/coreos_production_iso_image.iso of=

/dev/disk3s1 bs=1m

256+0 records in

256+0 records out

268435456 bytes transferred in 122.074793 secs (2198943 bytes/sec)

[~/Desktop]

Diskに焼くしかないな、しかし余ったDiskもないじゃねえか!!
と悩んだ挙句、公式にはこんなことを書いてありました。

https://coreos.com/os/docs/latest/installing-to-disk.html

The script is self-contained and located on GitHub here and can be run from any Linux distribution.
You cannot normally install CoreOS to the same device that is currently booted.
However, the CoreOS ISO or any Linux liveCD will allow CoreOS to install to a non-active device.

訳)
スクリプトはGitHub上にあり、
すべてのLinuxディストリビューションから実行することができます。
通常は現在ブートされているのと同じデバイスにCoreOSをインストールすることはできません。
しかしCoreOS ISOまたは任意のLinuxのLiveCDはCoreOSが非アクティブデバイスにインストールすることができます。

つまり、Linux上からスクリプトを叩いてインストールできる!!!
というわけでくにしーが持参してたUSBの中にTails Linuxがあったので、
こいつから以下のスクリプトを叩いてみました。
しかし、Tails Linuxとか半端ないセキュアLinuxで、
自分が操作したログなど全部残さず抹消してしまいます。
これはぱないのであとでUSBにインストールしてみよう。

・coreos-install.sh

#!/bin/bash
# Copyright (c) 2013 The CoreOS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
set -e -o pipefail
error_output() {
 echo "Error: return code $? from $BASH_COMMAND" >&2
}
# Ensure that required executables exist before proceeding
which wget >/dev/null || { echo 'Missing wget!' >&2 ; exit 1 ; }
which gpg >/dev/null || { echo 'Missing gpg!' >&2 ; exit 1 ; }
# Everything we do should be user-access only!
umask 077
if grep -q "^ID=coreos$" /etc/os-release; then
 source /etc/os-release
 [[ -f /usr/share/coreos/update.conf ]] && source /usr/share/coreos/update.conf
 [[ -f /etc/coreos/update.conf ]] && source /etc/coreos/update.conf
fi
# Fall back on the current stable if os-release isn't useful
: ${VERSION_ID:=current}
CHANNEL_ID=${GROUP:-stable}
OEM_ID=
if [[ -e /etc/oem-release ]]; then
 # Pull in OEM information too, but prefixing variables with OEM_
 eval "$(sed -e 's/^/OEM_/' /etc/oem-release)"
fi
USAGE="Usage: $0 [-V version] [-d /dev/device]
Options:
 -d DEVICE   Install CoreOS to the given device.
 -V VERSION  Version to install (e.g. current) [default: ${VERSION_ID}]
 -C CHANNEL  Release channel to use (e.g. beta) [default: ${CHANNEL_ID}]
 -o OEM      OEM type to install (e.g. ami) [default: ${OEM_ID:-(none)}]
 -c CLOUD    Insert a cloud-init config to be executed on boot.
 -i IGNITION Insert an Ignition config to be executed on boot.
 -t TMPDIR   Temporary location with enough space to download images.
 -v          Super verbose, for debugging.
 -b BASEURL  URL to the image mirror
 -n          Copy generated network units to the root partition.
 -h          This 😉
This tool installs CoreOS on a block device. If you PXE booted CoreOS on a
machine then use this tool to make a permanent install.
"
# Image signing key:
# pub   4096R/93D2DCB4 2013-09-06
# uid       [ unknown] CoreOS Buildbot (Offical Builds) <buildbot@coreos.com>
# sub   4096R/74E7E361 2013-09-06 [expired: 2014-09-06]
# sub   4096R/E5676EFC 2014-09-08 [expired: 2015-09-08]
# sub   4096R/1CB5FA26 2015-08-31 [expires: 2017-08-30]
# sub   4096R/B58844F1 2015-11-20 [revoked: 2016-05-16]
# sub   4096R/2E16137F 2016-05-16 [expires: 2017-05-16]
GPG_LONG_ID="50E0885593D2DCB4"
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=nV4h
—–END PGP PUBLIC KEY BLOCK—–
"
DEVICE=""
CLOUDINIT=""
while getopts "V:C:d:o:c:i:t:b:nvh" OPTION
do
 case $OPTION in
 V) VERSION_ID="$OPTARG" ;;
 C) CHANNEL_ID="$OPTARG" ;;
 d) DEVICE="$OPTARG" ;;
 o) OEM_ID="$OPTARG" ;;
 c) CLOUDINIT="$OPTARG" ;;
 i) IGNITION="$OPTARG" ;;
 t) export TMPDIR="$OPTARG" ;;
 v) set -x ;;
 b) BASE_URL="$OPTARG" ;;
 n) COPY_NET=1;;
 h) echo "$USAGE"; exit;;
 *) exit 1;;
 esac
done
# Device is required, must not be a partition, must be writable
if [[ -z "${DEVICE}" ]]; then
 echo "$0: No target block device provided, -d is required." >&2
 exit 1
fi
if ! [[ $(lsblk -n -d -o TYPE "${DEVICE}") =~ ^(disk|loop|lvm)$ ]]; then
 echo "$0: Target block device (${DEVICE}) is not a full disk." >&2
 exit 1
fi
if [[ ! -w "${DEVICE}" ]]; then
 echo "$0: Target block device (${DEVICE}) is not writable (are you root?)" >&2
 exit 1
fi
if [[ -n "${CLOUDINIT}" ]]; then
 if [[ ! -f "${CLOUDINIT}" ]]; then
 echo "$0: Cloud config file (${CLOUDINIT}) does not exist." >&2
 exit 1
 fi
 if type -P coreos-cloudinit >/dev/null; then
 if ! coreos-cloudinit -from-file="${CLOUDINIT}" -validate; then
 echo "$0: Cloud config file (${CLOUDINIT}) is not valid." >&2
 exit 1
 fi
 else
 echo "$0: coreos-cloudinit not found. Could not validate config. Continuing…" >&2
 fi
fi
if [[ -n "${IGNITION}" ]]; then
 if [[ ! -f "${IGNITION}" ]]; then
 echo "$0: Ignition config file (${IGNITION}) does not exist." >&2
 exit 1
 fi
fi
if [[ -n "${OEM_ID}" ]]; then
 IMAGE_NAME="coreos_production_${OEM_ID}_image.bin.bz2"
else
 IMAGE_NAME="coreos_production_image.bin.bz2"
fi
# for compatibility with old versions that didn't support channels
if [[ "${VERSION_ID}" =~ ^(alpha|beta|stable)$ ]]; then
 CHANNEL_ID="${VERSION_ID}"
 VERSION_ID="current"
fi
if [[ -z "${BASE_URL}" ]]; then
 BASE_URL="https://${CHANNEL_ID}.release.core-os.net/amd64-usr"
fi
# if the version is "current", resolve the actual version number
if [[ "${VERSION_ID}" == "current" ]]; then
 VERSION_ID=$(wget –quiet -O – "${BASE_URL}/${VERSION_ID}/version.txt" | \
 gawk –field-separator '=' '/COREOS_VERSION=/ { print $2 }')
 echo "Current version of CoreOS ${CHANNEL_ID} is ${VERSION_ID}"
fi
IMAGE_URL="${BASE_URL}/${VERSION_ID}/${IMAGE_NAME}"
SIG_NAME="${IMAGE_NAME}.sig"
SIG_URL="${BASE_URL}/${VERSION_ID}/${SIG_NAME}"
if ! wget –spider –quiet "${IMAGE_URL}"; then
 echo "$0: Image URL unavailable: $IMAGE_URL" >&2
 exit 1
fi
if ! wget –spider –quiet "${SIG_URL}"; then
 echo "$0: Image signature unavailable: $SIG_URL" >&2
 exit 1
fi
# Pre-flight checks pass, lets get this party started!
WORKDIR=$(mktemp –tmpdir -d coreos-install.XXXXXXXXXX)
trap "error_output ; rm -rf '${WORKDIR}'" EXIT
# Setup GnuPG for verifying the image signature
export GNUPGHOME="${WORKDIR}/gnupg"
mkdir "${GNUPGHOME}"
gpg –batch –quiet –import <<<"$GPG_KEY"
echo "Downloading the signature for ${IMAGE_URL}…"
wget –no-verbose -O "${WORKDIR}/${SIG_NAME}" "${SIG_URL}"
# We are at the point of no return, so wipe disk labels that are missed below.
# In particular, ZFS writes labels in the last half-MiB of the disk.
dd if=/dev/zero of="${DEVICE}" count=1024 2>/dev/null \
 seek=$(($(blockdev —getsz "${DEVICE}") – 1024))
echo "Downloading, writing and verifying ${IMAGE_NAME}…"
declare -a EEND
if ! wget –no-verbose -O – "${IMAGE_URL}" \
 | tee >(bunzip2 –stdout >"${DEVICE}") \
 | gpg –batch –trusted-key "${GPG_LONG_ID}" \
 –verify "${WORKDIR}/${SIG_NAME}" –
then
 EEND=(${PIPESTATUS[@]})
 [ ${EEND[0]} -ne 0 ] && echo "${EEND[0]}: Download of ${IMAGE_NAME} did not complete" >&2
 [ ${EEND[1]} -ne 0 ] && echo "${EEND[1]}: Cannot expand ${IMAGE_NAME} to ${DEVICE}" >&2
 [ ${EEND[2]} -ne 0 ] && echo "${EEND[2]}: GPG signature verification failed for ${IMAGE_NAME}" >&2
 wipefs –all –backup "${DEVICE}"
 exit 1
fi
# inform the OS of partition table changes
udevadm settle
for try in 0 1 2 4; do
 sleep "$try" # Give the device a bit more time on each attempt.
 blockdev –rereadpt "${DEVICE}" && unset try && break ||
 echo "Failed to reread partitions on ${DEVICE}" >&2
done
[ -z "$try" ] || exit 1
if [[ -n "${CLOUDINIT}" ]] || [[ -n "${COPY_NET}" ]]; then
 # The ROOT partition should be #9 but make no assumptions here!
 # Also don't mount by label directly in case other devices conflict.
 ROOT_DEV=$(blkid -t "LABEL=ROOT" -o device "${DEVICE}"*)
 mkdir -p "${WORKDIR}/rootfs"
 case $(blkid -t "LABEL=ROOT" -o value -s TYPE "${ROOT_DEV}") in
 "btrfs") mount -t btrfs -o subvol=root "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
 *)       mount "${ROOT_DEV}" "${WORKDIR}/rootfs" ;;
 esac
 trap "error_output ; umount '${WORKDIR}/rootfs' && rm -rf '${WORKDIR}'" EXIT
 if [[ -n "${CLOUDINIT}" ]]; then
 echo "Installing cloud-config…"
 mkdir -p "${WORKDIR}/rootfs/var/lib/coreos-install"
 cp "${CLOUDINIT}" "${WORKDIR}/rootfs/var/lib/coreos-install/user_data"
 fi
 if [[ -n "${COPY_NET}" ]]; then
 echo "Copying network units to root partition."
 # Copy the entire directory, do not overwrite anything that might exist there, keep permissions, and copy the resolve.conf link as a file.
 cp –recursive –no-clobber –preserve –dereference /run/systemd/network/* "${WORKDIR}/rootfs/etc/systemd/network"
 fi
 umount "${WORKDIR}/rootfs"
 trap "error_output ; rm -rf '${WORKDIR}'" EXIT
fi
if [[ -n "${IGNITION}" ]]; then
 # The OEM partition should be #6 but make no assumptions here!
 # Also don't mount by label directly in case other devices conflict.
 OEM_DEV=$(blkid -t "LABEL=OEM" -o device "${DEVICE}"*)
 mkdir -p "${WORKDIR}/oemfs"
 mount "${OEM_DEV}" "${WORKDIR}/oemfs"
 trap "error_output ; umount '${WORKDIR}/oemfs' && rm -rf '${WORKDIR}'" EXIT
 echo "Installing Ignition config ${IGNITION}…"
 cp "${IGNITION}" "${WORKDIR}/oemfs/coreos-install.json"
 echo "set linux_append=\"coreos.config.url=oem:///coreos-install.json\"" > "${WORKDIR}/oemfs/grub.cfg"
 umount "${WORKDIR}/oemfs"
 trap "error_output ; rm -rf '${WORKDIR}'" EXIT
fi
rm -rf "${WORKDIR}"
trap – EXIT
echo "Success! CoreOS ${CHANNEL_ID} ${VERSION_ID}${OEM_ID:+ (${OEM_ID})} is installed on ${DEVICE}"

view raw

coreos-install.sh

hosted with ❤ by GitHub

・インストール

1	# coreos-install -d /dev/sda

完了したらログインできるか確認してみた。
できないｗ
ググるとどうやらデフォルトのユーザーはcoreみたいだが、
パスは設定されていないことが分かった。
なんというセキュア。。てかどうすんだ。。
とりあえず公式にはこんなことが書いてあった。

https://coreos.com/os/docs/latest/booting-with-pxe.html

coreos.autologin: Drop directly to a shell on a given console without prompting for a password.
Useful for troubleshooting but use with caution.
For any console that doesn’t normally get a login prompt by default be sure to combine with the console option, e.g.
console=tty0 console=ttyS0 coreos.autologin=tty1 coreos.autologin=ttyS0.
Without any argument it enables access on all consoles.
Note that for the VGA console the login prompts are on virtual terminals (tty1, tty2, etc),
not the VGA console itself (tty0).

訳)
ログインプロンプトにautologinをぶち込めば一時的にログインしてやるぜ！

ちなみにCoreOSはCloud-Configに対応(AWSやDigitalOceanも)しており、
OS起動時にネットワーク、ユーザ、systemd、などなど設定してくれるのですが、
完全に忘れてました。。ｗ
以下のようにymlファイルを作ってCoreOSインストール時に指定すれば上記なことをする必要ありません。

~/cloud-config.yml

#cloud-config

coreos:

units:

- name: 10-static.network

runtime: no

content: |

[Match]

Name=enp0s8

[Network]

Address=192.168.3.56/24

users:

　　- name: core

　　passwd: hahahaha

　　groups: core

・CoreOSインストールとcloud-config

1	# coreos-install -d /dev/sda -C stable -c cloud-config.yml

■CoreOS初期設定

・ユーザーパス変更

・固定IPの変更

core@localhost ~ $ sudo vim /etc/systemd/network/static.network

[Match]

Name=enp6s0

[Network]

Address=192.168.3.56/24

Gateway=192.168.3.1

DNS=192.168.3.1

core@localhost ~ $ sudo reboot

・ホスト名変更

1	# hostnamectl set-hostname adachin-docker

・ログインシェルの変更

core@adachin-docker ~ $ cat /etc/motd

.d8888b. .d88888b. .d8888b.

d88P Y88b d88P" "Y88bd88P Y88b

888 888 888 888Y88b.

888 .d88b. 888d888 .d88b. 888 888 "Y888b.

888 d88""88b888P" d8P Y8b888 888 "Y88b.

888 888888 888888 88888888888 888 "888

Y88b d88PY88..88P888 Y8b. Y88b. .d88PY88b d88P

"Y8888P" "Y88P" 888 "Y8888 "Y88888P" "Y8888P"

CoreOS stable (1122.2.0)

カッコいい。

■コンテナ起動

core@adachin-docker ~ $ docker ps

CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES

ee594652ab55 tvirus17/nginx_centos6 "/bin/bash" 23 hours ago Up 23 hours 22/tcp, 80/tcp, 0.0.0.0:70->70/ tcp hungry_blackwell

あとはDNSでサブドメインの設定とルーターのポートを開けて、実際にnginxが動いてることを確認しました。

http://docker.blog.adachin.me:70/

■まとめ

毎回ルーターのポートを開放するのはめんどうなので、
プロキシ設定していろいろやりたいところ。
今のところ検証用サーバとして十分。
KVMとかメンドクサイし、コンテナ構成管理楽ちん。
引き続きdockerの検証はブログでアウトプットします。
くにしーいなかったら大変だった。
ありがとうの意味を込めて、
父が酒を作ってたくさん飲んでくれました。

%e3%82%b9%e3%82%af%e3%83%aa%e3%83%bc%e3%83%b3%e3%82%b7%e3%83%a7%e3%83%83%e3%83%88-2016-10-16-3-13-19

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