====== Home Directories on Arch Linux ======

====== Client Config ======

===== Packages =====

Install Required Packages 
<code>
pacman -S rpcbind nfs-utils nfsidmap
</code>

===== Configs =====

Change the lines in these files to the values defined.


<file|/etc/idmapd.conf>
Domain = acm.cs
</file>
<file|/etc/conf.d/nfs-common>
NEED_IDMAPD="yes"
</file>
<file|/etc/fstab>
172.29.0.6:/nfs-dir /mount-point nfs4 rw,hard,defaults 0 0
</file>
<file|/etc/systemd/timesyncd.conf>
[Time]
NTP=172.29.0.6 172.29.0.7
FallbackNTP=0.us.pool.ntp.org 1.us.pool.ntp.org 2.us.pool.ntp.org
</file>


===== Daemons =====

Two daemons need to be started after networking in order to mount NFS directories and one to keep things working right
  * rpcbind
  * nfs-common
  * systemd-timesyncd (timedatectl set-ntp true)

Start rpcbind then nfs-common, then you will be able to mount the nfs directories, add these entries to rc.conf in the daemons array after the network/net-profiles entries.

====== Server Config ======

Mozart is currently the NFS file server and is only accessible to members of the ACM LAN Admins group. 

Exported directories are located in /export, this is the NFS root
===== Packages =====

Install Required Packages 
<code>
pacman -S rpcbind nfs-utils nfsidmap openntpd
</code>

===== Configs =====

Change the lines in these files to the values defined.


The number of nfsd threads in increased from the default to improve preformance.
<file|/etc/conf.d/nfs-server>
# Number of servers to start up; the default is 8 servers.
NFSD_COUNT="32"
</file>
Configure the NTP server to sync against the US NTP pool and make sure that clients on the LAN have access
<file|/etc/ntpd.conf>
# sample ntpd configuration file, see ntpd.conf(5)

# Addresses to listen on (ntpd does not listen by default)
listen on 0.0.0.0

# sync to a single server
#server ntp.example.org

# use a random selection of NTP Pool Time Servers
# see http://support.ntp.org/bin/view/Servers/NTPPoolServers
servers us.pool.ntp.org
</file>

And finally this file controls the exporting of directories, and should have entries like these.
To prevent issues with wildcards or IP ranges, each client has a separete config
<file|/etc/exports>
/export		172.29.0.0/24(rw,fsid=0,no_subtree_check,async,no_root_squash)
/export/path-to-acm-home-dirs 172.29.0.2(rw,no_subtree_check,async,nohide,no_root_squash)
/export/skel 172.29.0.2(ro,no_subtree_check,async,nohide,no_root_squash)
</file>

===== Daemons =====

Three daemons need to be started after networking in order to serve NFS directories and one to keep things working right
  * rpcbind.service
  * nfs-client.target
  * nfs-server.service
  * opennptd.service

Start rpcbind, then nfs-common, and then nfs-server, then you will be able to mount the nfs directories, add these entries to rc.conf in the daemons array after the network/net-profiles entries.

Enable the appropriate daemons via the systemd systemctl command

===== Moving /var/lib/nfs to tempfs =====

To increase server preformance and reduce the number of lockups on the NFS clients, especially since many are workstations, /var/lib/nfs, the home pf the nfsd rpcpipefs, to a tempfs directory aka to memory rather than disk. Add this daemon to the daemons line of rc.conf **BEFORE** nfs-common and nfs-server.

Add this line to the fstab
<file| /etc/fstab>
none /var/lib/nfs tmpfs defaults,mode=0755 0 0
</file>

Copy /var/lib/nfs to a separate directory called /var/lib/nfs.d then add these files to setup the systemd service.

<file|/etc/systemd/system/nfsvartemp.service>

[Unit]
Description=NFS Tempfs Setup
Before=nfsd.service

[Service]
Type=oneshot
ExecStart=/usr/local/sbin/nfsvartemp

[Install]
WantedBy=multi-user.target

</file>

<file|/usr/local/sbin/nfsvartemp>
#!/bin/bash
cp -R /var/lib/nfs.d/* /var/lib/nfs
</file>

Lastly
<code>
systemctl enable nfsvartemp.service
</code>