# Alpine Host Setup

Setup steps for alpine container host using docker compose.

Download standard iso from https://alpinelinux.org/downloads/

## live system

boot from downloaded iso

### setup-alpine

```sh
setup-alpine
```

- Keyboard: `us-us` (adjust if needed)
- set hostname
- Network: `eth0`, `dhcp`, manual `n`
- set root password
- Timezone: `Europe/Berlin` (adjust if preferred)
- Proxy: `none`
- apk mirror: `f` (detect automatically)
- add user to your liking
- SSH server: `openssh`
- Select disk: `sda` (depending on your system)
- Disk Setup: `lvm`, then `sys`
- Erase disk: `y`

**Setup lvm (see next step) before reboot!**

### LVM

https://wiki.archlinux.org/title/LVM

```sh
# install some needed packages (only installed in live system)
apk add lvm2-extra e2fsprogs-extra device-mapper
# list existing LVs
lvs
# resize existing and create missing LVs
lvresize -L <SIZE>G [-r] /dev/vg0/<LV>
lvcreate -L <SIZE>G -n <LV NAME> vg0
lvcreate -l 100%FREE -n <LV NAME> vg0
# init filesystem for each newly created LV
mkfs.ext4 /dev/vg0/<LV>
```

```
LV                LSize  Mount
lv_root           8.00g  /
lv_logs           4.00g  /var/log
lv_containers    20.00g  /var/lib/containers
lv_swap            =RAM  swap
lv_srv            =REST  /srv
```

## Reboot into installed system

Remove/reorder boot iso. Reboot via hardreset, qemu-guest not functional yet!

### SSHD

```sh
vi /etc/ssh/sshd_config
```

- `Port 222`
- `PermitRootLogin no`
- `AllowTcpForwarding yes`

```sh
service sshd restart
```

### sudo

```sh
apk update && apk add sudo
visudo
```

Uncomment `%wheel ALL=(ALL:ALL) ALL` to allow users in 'wheel' group to use sudo.

## From here on you can use ssh and sudo

```sh
ssh -p 222 <username>@<hostname>
sudo -i # use only for setup, it's not good practice to use a root shell!
```

### Installed Packages

Enable community repo (uncomment line):

```sh
vi /etc/apk/repositories
```

Install needed packages. Check and adjust to your needs.

```sh
apk update && apk upgrade && apk add \
    gettext \
    awall \
    curl \
    docker \
    docker-zsh-completion \
    git \
    htop \
    nano \
    qemu-guest-agent \
    sudo \
    tree \
    wireguard-tools \
    zsh \
```

### zsh

```sh
nano /etc/passwd
```

- Change to `/bin/zsh` for desired user.

#### ohmyzsh

https://ohmyz.sh/#install

```sh
sh -c "$(wget https://raw.github.com/ohmyzsh/ohmyzsh/master/tools/install.sh -O -)"
```

- Theme: amuse
- `export EDITOR=nano`

### fstab

```sh
nano /etc/fstab
```

fstab content:

```
/dev/vg0/lv_root        /                       ext4    rw,relatime 0 1
/dev/vg0/lv_logs        /var/log                ext4    rw,relatime 0 2
/dev/vg0/lv_containers  /var/lib/containers     ext4    rw,relatime 0 2
/dev/vg0/lv_srv         /srv                    ext4    rw,relatime 0 2
```

To mount all:

```sh
mount -a
```

### ntp

```sh
rc-update add ntpd
service ntpd start
```

### checkout repo

```sh
cd /opt
git clone <this repo's url>
```

### awall

https://www.cyberciti.biz/faq/how-to-set-up-a-firewall-with-awall-on-alpine-linux/  
https://github.com/alpinelinux/awall/blob/master/README.md  
https://ipset.netfilter.org/iptables-extensions.man.html#lbAO  

If error `modprobe: FATAL: Module ip_tables not found...` -> reboot

```sh
cd /etc/awall/optional
ln -vs /opt/container-server/setup/awall/* .
awall enable {default,ssh,http}
awall activate
```

### docker

https://wiki.alpinelinux.org/wiki/Docker
https://docs.docker.com/engine/logging/drivers/local/

```sh
mkdir -p /etc/docker
cd /etc/docker
ln -vs /opt/container-server/setup/docker/daemon.json .
rc-update add docker
service docker start
```

### docker-compose

https://docs.docker.com/compose/install/standalone/

docker-compose in system packages or pip is outdated, we need to install it manually

```sh
curl -SL https://github.com/docker/compose/releases/latest/download/docker-compose-linux-x86_64 -o /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
```

### mta

Allow system to send mail

```sh
setup-mta
```

Set outgoing mail server to localhost

### cron

Link the crons:
```sh
mkdir -p /etc/periodic/always/
for part in /opt/container-server/setup/cron/*; do
    ln -vs $part/* /etc/periodic/${part##*/}/
done
```

Update crontab:
```sh
crontab -e
```

Add first line: `MAILTO=cron@<your domain>`  
Add following cron entry: `*   *   *   *   *   run-parts /etc/periodic/always`  

### cgroup mode

To allow woodpecker build Dockerfiles, set correct cgroup mode.

```sh
nano /etc/rc.conf
reboot
```

Set `rc_cgroup_mode="unified`

### memory overcommit

https://redis.io/docs/latest/develop/get-started/faq/#background-saving-fails-with-a-fork-error-on-linux
https://www.kernel.org/doc/Documentation/vm/overcommit-accounting

```sh
cd /etc/sysctl.d
ln -vs /opt/container-server/setup/sysctl.d/* .
```