{{tag>[hardware apu centos]}}
=====PC Engines APU - install CentOS 7=====
This pages describes the installation of CentOS 7 on PC Engines APU hardware.

====Preparation====
===Console===
  * Connect a serial console, or USB<->Serial adapter. Make sure your locale is set to UTF-8. <code>$ locale
LANG="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_CTYPE="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_ALL="en_US.UTF-8"</code>
  * If locale is not set right, add the following lines to your ~/.profile and login again.<code>export LC_ALL=en_US.UTF-8
export LANG=en_US.UTF-8</code>
  * Connect to serial console:<code>screen /dev/tty.usbserial-A7022O5B 115200</code>
===PXE===
  * Edit /tftpboot/pxelinux.cfg/default: <code>serial 0 115200
default centos7
prompt 0
timeout 0

label centos7
  kernel http://yourrepo.host/centos/7/CentOS7-base/images/pxeboot/vmlinuz
  append initrd=http://yourrepo.host/centos/7/CentOS7-base/images/pxeboot/initrd.img ks.device=bootif ip=dhcp ks=http://yourpxe.host/apu-centos7.ks console=ttyS0,115200</code>
===Kickstart===
  * Edit kickstart file apu-centos7.ks:<code>####
#### PC Engines APU KickStart installation
####
install

# Base repo
url --url=http://repo/centos/7/CentOS7-base
# Configure updates repo
repo --name="CentOS7-updates"  --baseurl=http://repo/centos/7/CentOS7-updates

network --onboot yes --bootproto dhcp
lang en_US.UTF-8
keyboard --vckeymap=us --xlayouts='us','us'
rootpw --iscrypted <sha512 password hash>
firewall --service=ssh
authconfig --enableshadow --passalgo=sha512
selinux --enforcing
timezone --utc Europe/Amsterdam

# Set serial console and change disk elevator to noop for SSD.
bootloader --location=mbr --driveorder=sda --append="console=tty0 console=ttyS0,115200 elevator=noop rd_NO_PLYMOUTH"

# Any disks whose formatting is unrecognized are initialized.
zerombr

# Erases all partitions from the system.
clearpart --all --drives=sda --initlabel

# Initialize boot partition.
part /boot --fstype=xfs --size=512 --asprimary

# Create LVM pv and vg.
part pv.01 --size=1000 --grow --asprimary
volgroup vg pv.01

# Create lv's, set discard, noatime and commit time. Leave some space left in the VG for later use.
logvol swap  --vgname=vg --size=512  --name=lv_swap --fstype=swap
logvol /     --vgname=vg --size=4096 --name=lv_root --fstype=xfs
logvol /var  --vgname=vg --size=4096 --name=lv_var  --fstype=xfs
logvol /home --vgname=vg --size=512  --name=lv_home --fstype=xfs

# Create non administrative user
user --name=username --homedir=/home/username --password=<sha512 password hash>

# Reboot after installation.
reboot

# Install minimal, exclude @Base, exclude documentation
%packages --nobase --excludedocs
@Core		#default
bind-utils      #dig, host, nslookup
openssh-clients #ssh client, key agent, sftp, scp
nc		#nc (netcat)
%end

%post
# Disable SSH root login
/bin/sed -i.bak 's/#PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config

# Mount /tmp as tmpfs.
systemctl enable tmp.mount

#Add weekly fstrim job
cat << EOF >  /etc/cron.weekly/fstrim
#!/bin/sh
#this script will run weekly, will overwrite log.

trimlog=/var/log/fstrim.log
echo > \$trimlog
for fs in \$(lsblk -o MOUNTPOINT,DISC-MAX,FSTYPE | grep -E '^/.* [1-9]+.* ' | awk '{print \$1}'); do
  printf "\`date\` - \`fstrim -v \$fs\`\n" >>\$trimlog
done
EOF
chmod +x /etc/cron.weekly/fstrim

# Enable LVM to issue discards.
/bin/sed -i.bak 's/issue_discards = 0/issue_discards = 1/g' /etc/lvm/lvm.conf

# Reduce swappiness.
echo "vm.swappiness=1" >> /etc/sysctl.d/swappiness.conf
echo "vm.vfs_cache_pressure=50" >> /etc/sysctl.d/swappiness.conf

# Set chassis name and icon
/bin/hostnamectl set-chassis "server"

exit 0
%end</code>
====Installation====
  * Boot the APU and press F12, select "iPXE" to boot from network.