Experience on Setting Up Alpine Linux

Starting out as one of the little unknown GNU/Linux distros, Alpine Linux has gain a lot of traction due to its featureful yet tiny size and the emergence of Linux Container implementation like Dockers and LXC. Although I came across it numerous time while testing out Dockers and LXC, I didn't pay much attention until recently while troubleshooting LXD. To summarize it, I really like the minimalist approach of Alpine Linux as for server or hardware appliance usage, nothing beats the simple direct approach.

My setup is based on the LXC container in Fedora 23. Unfortunately, you still can't create unprivileged container in Fedora. Hence, I have no choice but to do everything as root user. Not the best outcome but I can live with that. Setup and creation is pretty much straight forward thanks to this guide. The steps as follows:

Install and necessary packages and make sure the lxcbr0 bridge interface is up.
$ sudo dnf install lxc lxc-libs lxc-extra lxc-templates
$ sudo systemctl restart lxc-net
$ sudo systemctl status lxc-net
$ ifconfig lxcbr0

Create our container. By default, LXC will download apk package manager binary and all necessary default packages to create the container. Start the 'test-alpine' container once the container has been set up successfully.
$ sudo lxc-create -n test-alpine -t alpine
$ sudo lxc-start -n test-alpine

Access to the container through the console and press 'Enter'. Login as 'root' user but without any password, just press enter. Note to exist from the console, press 'Ctrl+q'.
$ sudo lxc-console -n test-alpine

Next, bring up the eth0 interface we can obtain an IP and making connection to the Internet. Check your eth0 network interface once done. Instead of SysV or Systemd, Alpine Linux is using OpenRC as its default init system. I've a hard time adjusting changes from SysV to Systemd and glad Alpine Linux did not jump to the Systemd bandwagon.
test-alpine:~# rc-service networking start
 * Starting networking ... *   lo ...ip: RTNETLINK answers: File exists
 [ !! ]
 *   eth0 ... [ ok ]

test-alpine:~# ifconfig eth0
eth0      Link encap:Ethernet  HWaddr 00:16:3E:6B:F7:8B  
          inet addr:  Bcast:  Mask:
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1562 (1.5 KiB)  TX bytes:1554 (1.5 KiB)

Next, configure out system. Similarly to Debian's dpkg-reconfigure, Alpine have a list of setup commands to configure your system. However, I prefer the consistent and sensible naming used here. This is something that other GNU/Linux distros should follow. I'm looking at you CentOS/Red Hat/Fedora.
test-alpine:~# setup-
setup-acf        setup-bootable         setup-hostname      setup-mta     setup-timezone
setup-alpine     setup-disk             setup-interfaces    setup-ntp     setup-xen-dom0
setup-apkcache   setup-dns              setup-keymap        setup-proxy   setup-xorg-base
setup-apkrepos   setup-gparted-desktop  setup-lbu           setup-sshd

Next, setup the package repository and let the system pick the fastest mirror. I like that we can pick the fastest mirror in the console, which is something impossible to do so in Debian/Ubuntu.
# setup-apkrepos

1) nl.alpinelinux.org
2) dl-2.alpinelinux.org
3) dl-3.alpinelinux.org
4) dl-4.alpinelinux.org
5) dl-5.alpinelinux.org
6) dl-6.alpinelinux.org
7) dl-7.alpinelinux.org
8) distrib-coffee.ipsl.jussieu.fr
9) mirror.yandex.ru
10) mirrors.gigenet.com
11) repos.lax-noc.com
12) repos.dfw.lax-noc.com
13) repos.mia.lax-noc.com
14) mirror1.hs-esslingen.de
15) mirrors.centarra.com
16) liskamm.alpinelinux.uk
17) mirrors.2f30.org
18) mirror.leaseweb.com

r) Add random from the above list
f) Detect and add fastest mirror from above list
e) Edit /etc/apk/repositores with text editor

Enter mirror number (1-18) or URL to add (or r/f/e/done) [f]: 
Finding fastest mirror... 
  3.07 http://nl.alpinelinux.org/alpine/
  4.43 http://dl-2.alpinelinux.org/alpine/
  4.18 http://dl-3.alpinelinux.org/alpine/
  4.43 http://dl-4.alpinelinux.org/alpine/
  7.56 http://dl-5.alpinelinux.org/alpine/
  4.45 http://dl-6.alpinelinux.org/alpine/
ERROR: http://dl-7.alpinelinux.org/alpine/edge/main: No such file or directory
 12.75 http://distrib-coffee.ipsl.jussieu.fr/pub/linux/alpine/alpine/
  3.27 http://mirror.yandex.ru/mirrors/alpine/
  3.55 http://mirrors.gigenet.com/alpinelinux/
 27.07 http://repos.lax-noc.com/alpine/
  3.87 http://repos.dfw.lax-noc.com/alpine/
 20.34 http://repos.mia.lax-noc.com/alpine/
  3.55 http://mirror1.hs-esslingen.de/pub/Mirrors/alpine/
ERROR: http://mirrors.centarra.com/alpine/edge/main: network error (check Internet connection and firewall)
  4.96 http://liskamm.alpinelinux.uk/
  4.45 http://mirrors.2f30.org/alpine/
  5.61 http://mirror.leaseweb.com/alpine/
Added mirror nl.alpinelinux.org
Updating repository indexes... done.

Update our system. Even though there are more than five thousands packages, it is still not comparable to massive Debian list of available packages. But this is understandable due to the small number of contributors and their limited free time.
test-alpine:~# apk update
fetch http://dl-6.alpinelinux.org/alpine/v3.2/main/x86_64/APKINDEX.tar.gz
fetch http://nl.alpinelinux.org/alpine/v3.2/main/x86_64/APKINDEX.tar.gz
v3.2.3-104-g838b3e3 [http://dl-6.alpinelinux.org/alpine/v3.2/main]
v3.2.3-104-g838b3e3 [http://nl.alpinelinux.org/alpine/v3.2/main]
OK: 5289 distinct packages available

Let's continue by installing a software package. We'll use Git version control as our example. Installation is straight forwards with enough details.
test-alpine:~# apk add git
(1/13) Installing run-parts (4.4-r0)
(2/13) Installing openssl (1.0.2d-r0)
(3/13) Installing lua5.2-libs (5.2.4-r0)
(4/13) Installing lua5.2 (5.2.4-r0)
(5/13) Installing ncurses-terminfo-base (5.9-r3)
(6/13) Installing ncurses-widec-libs (5.9-r3)
(7/13) Installing lua5.2-posix (33.3.1-r2)
(8/13) Installing ca-certificates (20141019-r2)
(9/13) Installing libssh2 (1.5.0-r0)
(10/13) Installing curl (7.42.1-r0)
(11/13) Installing expat (2.1.0-r1)
(12/13) Installing pcre (8.37-r1)
(13/13) Installing git (2.4.1-r0)
Executing busybox-1.23.2-r0.trigger
Executing ca-certificates-20141019-r2.trigger
OK: 23 MiB in 28 packages

So far, I love the simplicity provided by Alpine Linux. In coming months, there will be more post on this tiny distro in coming months. Stay tuned.

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