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Building the XNAT Relays

This is a verbose documentation of the build process used to assemble and build the DICOM and RAW data relays used for the Lifespan studies.  

This content may be partially complete


Server Setup

Hardware

  1. Set boot disk(s) to the SSDs and disable spinning disks from booting
  2. Label disks using XNAT DICOM/RAW Relay Build
  3. Label network ports XNAT DICOM/RAW Relay Build

BIOS Settings

Boot Features

PCIe/PCI/PnP Configuration
 - Turn off LAN OPROM on all ports

Set the boot order

Set Hard Drive BBS Priorities

Set boot to the C1::P0: and C1::P1: attached SSD and disable booting from the data disks.


Operating System

  1. CentOS 7 - Graphical Server install
    1. Use manual partitioning
      1. Select SSD and auto generate legacy layout
      2. Delete the /home partition (This space will be used for ZFS cache)
    2. Set timezone to US/Central (Chicago)
      1. Turn on network time
    3. Create hcpadmin user
    4. Set root password (needed if runlevel 1 is necessary)

    5. Install additional packages

      Packages

      BASH 
      yum install httpd tomcat mutt pgadmin3 httpd-devel gcc gcc-c++ make libtool apxs mod_ssl xinetd tree
  2. ZFS

    1. Install ZFS 

      Install ZFS

      BASH 
      yum -y install epel-release
yum -y install http://download.zfsonlinux.org/epel/zfs-release.el7_3.noarch.rpm
 
# Disable DKMS and enable KMOD
vim /etc/yum.repos.d/zfs.repo 

yum -y install zfs zfs-dracut
yum update

    2. Reboot to apply updated kernel

    3. Create /etc/zfs/vdev_id.conf with the following contents:

      vdev_id.conf

      BASH 
      alias   disk1   pci-0000:00:17.0-ata-1.0
alias   disk2   pci-0000:00:17.0-ata-2.0
alias   disk3   pci-0000:00:17.0-ata-3.0
alias   disk4   pci-0000:00:17.0-ata-4.0
alias   ssd1    pci-0000:00:18.0-ata-1.0
alias   ssd2    pci-0000:00:18.0-ata-2.0
    4. Reboot to populate /dev/disk/by-vdev 

    5. Create the zpool and set it up.      

      Create zpool

      BASH 
      zpool create -f relaypool raidz2 disk1 disk2 disk3 disk4
zfs set compression=lz4 relaypool
zfs set sync=disabled relaypool
zfs create relaypool/zfs_tools
zfs create -o mountpoint=/raw relaypool/raw
zfs create relaypool/raw/data
zfs create relaypool/raw/scripts
zfs create -o mountpoint=/xnat relaypool/xnat
zfs create relaypool/xnat/archive
zfs create relaypool/xnat/prearchive
zfs create relaypool/xnat/tmp
zfs create relaypool/xnat/build
zfs create relaypool/xnat/cache
zfs create relaypool/xnat/logs
zfs create relaypool/xnat/home
zfs create -p relaypool/xnat/pgsql/9.4
zfs create relaypool/rpool_backup
zfs set reservation=100G relaypool/zfs_tools
 
zfs set quota=7T relaypool
zfs set edu.wustl.nrg:quotareports=2 relaypool
zfs set edu.wustl.nrg:quotareport:1="2T|warning|relay-ops@nrg.wustl.edu|2d" relaypool
zfs set edu.wustl.nrg:quotareport:2="512G|critical|relay-ops@nrg.wustl.edu|12h" relaypool
# Make pool auto import and mount on boot
systemctl enable zfs-import-cache.service
systemctl enable zfs-mount.service
# Enable ZFS event daemon
systemctl enable zfs-zed.service

    6. Reboot the system so the kernel is familiar with the changes.

    7. Limit ARC to 1/2 the system ram.  (Assuming 16GB ram installed)

      Limit ARC

      BASH 
      echo "options zfs zfs_arc_max=8589934592" >> /etc/modprobe.d/zfs.conf
echo "8589934592" > /sys/module/zfs/parameters/zfs_arc_max

    8. Install OZMT and create snapshot jobs

      Install OZMT

      BASH 
      yum install mercurial
cd /opt
hg clone https://bitbucket.org/ozmt/ozmt
cd ozmt
./install-ozmt.sh
ozmt-snapjobs-add.sh relaypool/raw/scripts daily/7 weekly/4 monthly/3
ozmt-snapjobs-add.sh relaypool/raw/data hourly/6 daily/1
ozmt-snapjobs-add.sh relaypool/zfs_tools hourly/12 daily/7 weekly/4 monthly/3 
ozmt-snapjobs-add.sh relaypool/xnat/archive hourly/6 daily/1
ozmt-snapjobs-add.sh relaypool/xnat/prearchive hourly/6 daily/1
ozmt-snapjobs-add.sh relaypool/xnat/home daily/7 weekly/4
ozmt-snapjobs-add.sh relaypool/xnat/logs daily/7 weekly/4 monthly/6
ozmt-snapjobs-add.sh relaypool/xnat/pgsql/9.4 daily/7 weekly/4 monthly/6

    9. Scrub the pool daily
      Add to root's crontab:

      Scrub zpool

      BASH 
      # Scrub the zpool
0 10 * * * /sbin/zpool scrub relaypool
1 10 * * * /sbin/zpool scrub rpool

    10. Comment out the replication jobs in root's crontab:

      Disable ZFS Replication

      BASH 
      #* * * * *    /opt/ozmt/replication/schedule-replication.sh
#1,11,21,31,41,51 * * * *    /opt/ozmt/replication/replication-job-runner.sh
#5,15,25,35,45,55 * * * *    /opt/ozmt/replication/replication-job-cleaner.sh
  3. ZFS root

    1. Setup second SSD

      Setup rpool

      BASH 
      sgdisk -a1 -n2:34:2047  -t2:EF02 /dev/disk/by-vdev/ssd2
sgdisk     -n9:-8M:0    -t9:BF07 /dev/disk/by-vdev/ssd2
# rpool
sgdisk     -n1:0:40G    -t1:BF01 /dev/disk/by-vdev/ssd2
# cache
sgdisk     -n3:0:+40G   -t3:BF01 /dev/disk/by-vdev/ssd2
# swap
sgdisk     -n4:0:+8G    -t4:8200 /dev/disk/by-vdev/ssd2
 
 
zpool create -f -d -o feature@async_destroy=enabled -o feature@empty_bpobj=enabled \
    -o feature@lz4_compress=enabled -o ashift=12 -O compression=lz4 -O canmount=off \
    -O mountpoint=/ -R /mnt/rpool \
    rpool /dev/disk/by-vdev/ssd2-part1


zfs create -o canmount=off -o mountpoint=none rpool/ROOT
zfs create -o canmount=noauto -o mountpoint=/ rpool/ROOT/centos
zfs mount rpool/ROOT/centos
zfs create -o setuid=off                              rpool/home
zfs create -o mountpoint=/root                        rpool/home/root
zfs create -o canmount=off -o setuid=off -o exec=off  rpool/var
zfs create -o com.sun:auto-snapshot=false             rpool/var/cache
zfs create                                            rpool/var/log
zfs create                                            rpool/var/spool
zfs create -o com.sun:auto-snapshot=false -o exec=on  rpool/var/tmp
zfs create -o mountpoint=/owncloud                    rpool/owncloud
 
mkdir /mnt/tmp
mount --bind / /mnt/tmp
 
rsync -avhX --stats /mnt/tmp/. /mnt/rpool/.
rsync -avhX --stats /boot/. /mnt/rpool/boot/.
 
for dir in proc sys dev;do mount --rbind /$dir /mnt/rpool/$dir;done
 
chroot /mnt/rpool /bin/bash --login
 
cd /dev;ln -s /dev/disk/by-vdev/* .;cd
 
rm /etc/zfs/zpool.cache

    2. Comment out all mounts in /etc/fstab

      /etc/fstab

      BASH 
      #
# /etc/fstab
# Created by anaconda on Mon Oct 31 10:11:52 2016
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
#UUID=0078e373-f435-4b66-b08d-df5cf1300554 /                       xfs     defaults        0 0
#UUID=c952f347-1ebe-49eb-be3d-213f8f69f37d /boot                   xfs     defaults        0 0
#UUID=fa96a497-bbd0-42ef-9507-1c6b6a27586a swap                    swap    defaults        0 0

    3. Add two lines to /etc/default/grub

      /etc/default/grub

      BASH 
      GRUB_CMDLINE_LINUX="crashkernel=auto boot=zfs rpool=rpool bootfs=rpool/ROOT/centos zfsforce=1"
GRUB_PRELOAD_MODULES="part_gpt zfs"

      You might need to comment-out GRUB_HIDDEN_TIMEOUT so you get grub menu during boot. This is needed to be able to select other boot entries.

      #GRUB_HIDDEN_TIMEOUT=0

    4. Generate new grub config, and verify it has the correct root entry

      grub config

      BASH 
      grub2-mkconfig -o /boot/grub2/grub.cfg
grep ROOT /boot/grub2/grub.cfg
grub2-install /dev/disk/by-vdev/ssd2
 

    5. Enable ZFS services

      BASH 
      systemctl enable zfs-import-cache
systemctl enable zfs-import-scan
systemctl enable zfs-mount
systemctl enable zfs-share
systemctl enable zfs-zed
systemctl enable zfs.target

    6. Add zfs to the list of modules dracut should include by default to /etc/dracut.conf

      /etc/dracut.conf

      BASH 
      # PUT YOUR CONFIG HERE OR IN separate files named *.conf
# in /etc/dracut.conf.d
# SEE man dracut.conf(5)
# Sample dracut config file
#logfile=/var/log/dracut.log
#fileloglvl=6
# Exact list of dracut modules to use.  Modules not listed here are not going
# to be included.  If you only want to add some optional modules use
# add_dracutmodules option instead.
#dracutmodules+=""
# dracut modules to omit
#omit_dracutmodules+=""
# dracut modules to add to the default
add_dracutmodules+="zfs"
# additional kernel modules to the default
#add_drivers+=""
# list of kernel filesystem modules to be included in the generic initramfs
#filesystems+=""
# build initrd only to boot current hardware
#hostonly="yes"
#
# install local /etc/mdadm.conf
#mdadmconf="no"
# install local /etc/lvm/lvm.conf
#lvmconf="no"
# A list of fsck tools to install. If it's not specified, module's hardcoded
# default is used, currently: "umount mount /sbin/fsck* xfs_db xfs_check
# xfs_repair e2fsck jfs_fsck reiserfsck btrfsck". The installation is
# opportunistic, so non-existing tools are just ignored.
#fscks=""
# inhibit installation of any fsck tools
#nofscks="yes"
# mount / and /usr read-only by default
#ro_mnt="no"
# set the directory for temporary files
# default: /var/tmp
#tmpdir=/tmp

    7. Rebuild initramfs

      Rebuild initramfs

      CODE 
      dracut -f -v /boot/initramfs-$(uname -r).img $(uname -r)



    8. Setup links in /dev on each boot
      chmod +x /etc/rc.local
      vim /etc/rc.local 

      /etc/rc.local

      BASH 
      #!/bin/bash
# THIS FILE IS ADDED FOR COMPATIBILITY PURPOSES
#
# It is highly advisable to create own systemd services or udev rules
# to run scripts during boot instead of using this file.
#
# In contrast to previous versions due to parallel execution during boot
# this script will NOT be run after all other services.
#
# Please note that you must run 'chmod +x /etc/rc.d/rc.local' to ensure
# that this script will be executed during boot.
touch /var/lock/subsys/local

cd /dev;ln -s /dev/disk/by-id/* .

    9. Setup ZED
      Edit /etc/zfs/zed.d/zed.rc:

      ZED

      BASH 
      ##
# zed.rc
#
# This file should be owned by root and permissioned 0600.
##
##
# Absolute path to the debug output file.
#
#ZED_DEBUG_LOG="/tmp/zed.debug.log"
##
# Email address of the zpool administrator for receipt of notifications;
#   multiple addresses can be specified if they are delimited by whitespace.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
# Disabled by default; uncomment to enable.
#
ZED_EMAIL_ADDR="root nrg-admin@nrg.wustl.edu"
##
# Name or path of executable responsible for sending notifications via email;
#   the mail program must be capable of reading a message body from stdin.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
#
#ZED_EMAIL_PROG="mail"
##
# Command-line options for ZED_EMAIL_PROG.
# The string @ADDRESS@ will be replaced with the recipient email address(es).
# The string @SUBJECT@ will be replaced with the notification subject;
#   this should be protected with quotes to prevent word-splitting.
# Email will only be sent if ZED_EMAIL_ADDR is defined.
#
ZED_EMAIL_OPTS="-s '@SUBJECT@' @ADDRESS@"
##
# Default directory for zed lock files.
#
#ZED_LOCKDIR="/var/lock"
##
# Minimum number of seconds between notifications for a similar event.
#
ZED_NOTIFY_INTERVAL_SECS=3600
##
# Notification verbosity.
#   If set to 0, suppress notification if the pool is healthy.
#   If set to 1, send notification regardless of pool health.
#
ZED_NOTIFY_VERBOSE=1
##
# Pushbullet access token.
# This grants full access to your account -- protect it accordingly!
#   <https://www.pushbullet.com/get-started>
#   <https://www.pushbullet.com/account>
# Disabled by default; uncomment to enable.
#
#ZED_PUSHBULLET_ACCESS_TOKEN=""
##
# Pushbullet channel tag for push notification feeds that can be subscribed to.
#   <https://www.pushbullet.com/my-channel>
# If not defined, push notifications will instead be sent to all devices
#   associated with the account specified by the access token.
# Disabled by default; uncomment to enable.
#
#ZED_PUSHBULLET_CHANNEL_TAG=""
##
# Default directory for zed state files.
#
#ZED_RUNDIR="/var/run"
##
# Replace a device with a hot spare after N checksum errors are detected.
# Disabled by default; uncomment to enable.
#
#ZED_SPARE_ON_CHECKSUM_ERRORS=10
##
# Replace a device with a hot spare after N I/O errors are detected.
# Disabled by default; uncomment to enable.
#
#ZED_SPARE_ON_IO_ERRORS=1
##
# The syslog priority (e.g., specified as a "facility.level" pair).
#
#ZED_SYSLOG_PRIORITY="daemon.notice"
##
# The syslog tag for marking zed events.
#
#ZED_SYSLOG_TAG="zed"

    10. Create swap space

      Setup swap space

      BASH 
      mkswap /dev/disk/by-vdev/ssd2-part4
echo "/dev/disk/by-vdev/ssd2-part4    swap                    swap    defaults        0 0" >> /etc/fstab
    11. Reboot
  4. Enter BIOS and change boot to ZFS root disk
    (Missing attachment)
  5. Confirm zfs root is running properly

    1. List zpool status and zfs

      Check ZFS

      CODE 
      # zpool status
  pool: rpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: none requested
config:
        NAME                                                   STATE     READ WRITE CKSUM
        rpool                                                  ONLINE       0     0     0
          ata-Samsung_SSD_750_EVO_120GB_S33MNB0H911742A-part1  ONLINE       0     0     0
errors: No known data errors
 
# zfs list
NAME                  USED  AVAIL  REFER  MOUNTPOINT
rpool                4.96G  33.5G   136K  /
rpool/ROOT           4.53G  33.5G   136K  none
rpool/ROOT/centos    4.53G  33.5G  4.39G  /
rpool/home           4.97M  33.5G   156K  /home
rpool/home/hcpadmin  4.04M  33.5G  3.85M  /home/hcpadmin
rpool/home/root       712K  33.5G   540K  /root
rpool/var             433M  33.5G   136K  /var
rpool/var/cache       413M  33.5G   412M  /var/cache
rpool/var/log        17.4M  33.5G  16.8M  /var/log
rpool/var/spool      1.70M  33.5G  1.19M  /var/spool
rpool/var/tmp         876K  33.5G   604K  /var/tmp
 
# zfs list -o name,mounted,mountpoint
NAME                 MOUNTED  MOUNTPOINT
rpool                     no  /
rpool/ROOT                no  none
rpool/ROOT/centos        yes  /
rpool/home               yes  /home
rpool/home/hcpadmin      yes  /home/hcpadmin
rpool/home/root          yes  /root
rpool/var                 no  /var
rpool/var/cache          yes  /var/cache
rpool/var/log            yes  /var/log
rpool/var/spool          yes  /var/spool
rpool/var/tmp            yes  /var/tmp


# Confirm swap is mounted
# free
              total        used        free      shared  buff/cache   available
Mem:       16405364      905724    14940016        9152      559624    14992148
Swap:       8388604           0     8388604

      If any zfs folders are not mounted besides rpool, rpool/ROOT and rpool/home these need to be corrected before proceeding.

  6. Setup mirror to original SSD

    1. Re-import relaypool

      zpool import

      BASH 
      zpool import relaypool

    2. Delete all partitions from original SSD 

      fdisk

      BASH 
      fdisk /dev/disk/by-vdev/ssd1

    3. Setup partition

      Partition SSD

      BASH 
      sgdisk -g -a1 -n2:34:2047  -t2:EF02 /dev/disk/by-vdev/ssd1
sgdisk        -n9:-8M:0    -t9:BF07 /dev/disk/by-vdev/ssd1
# rpool
sgdisk        -n1:0:40G    -t1:BF01 /dev/disk/by-vdev/ssd1
# cache
sgdisk        -n3:0:+40G   -t3:BF01 /dev/disk/by-vdev/ssd1
# swap
sgdisk        -n4:0:+8G    -t4:8200 /dev/disk/by-vdev/ssd1

    4. Mirror rpool.
      First determine the device name of the existing disk.

      zpool status

      BASH 
      # zpool status
  pool: rpool
 state: ONLINE
status: Some supported features are not enabled on the pool. The pool can
        still be used, but some features are unavailable.
action: Enable all features using 'zpool upgrade'. Once this is done,
        the pool may no longer be accessible by software that does not support
        the features. See zpool-features(5) for details.
  scan: none requested
config:
        NAME                                                   STATE     READ WRITE CKSUM
        rpool                                                  ONLINE       0     0     0
          ata-Samsung_SSD_750_EVO_120GB_S33MNB0H911742A-part1  ONLINE       0     0     0
errors: No known data errors

      Attach the other SSD.  (Substitute the device name returned from zpool status).

      zpool attach

      BASH 
      # zpool attach rpool ata-Samsung_SSD_750_EVO_120GB_S33MNB0H911742A-part1 ssd1-part1

      Wait for the rpool to resilver.

      zpool status

      BASH 
      # zpool status
  pool: rpool
 state: ONLINE
status: One or more devices is currently being resilvered.  The pool will
        continue to function, possibly in a degraded state.
action: Wait for the resilver to complete.
  scan: resilver in progress since Wed Nov 30 11:30:23 2016
    3.03G scanned out of 4.97G at 73.9M/s, 0h0m to go
    3.03G resilvered, 61.06% done
config:
        NAME                                                     STATE     READ WRITE CKSUM
        rpool                                                    ONLINE       0     0     0
          mirror-0                                               ONLINE       0     0     0
            ata-Samsung_SSD_750_EVO_120GB_S33MNB0H911742A-part1  ONLINE       0     0     0
            ssd1-part1                                           ONLINE       0     0     0  (resilvering)
errors: No known data errors
    5. Reboot

    6. Re-apply grub setup

      grub config

      BASH 
      cd /dev;ln -s /dev/disk/by-id/*
grub2-mkconfig -o /boot/grub2/grub.cfg
grep ROOT /boot/grub2/grub.cfg
grub2-install /dev/disk/by-vdev/ssd1 
grub2-install /dev/disk/by-vdev/ssd2

    7. Create snaphot policies

      Snapshots

      BASH 
      zfs create -o mountpoint=/rpool/zfs_tools rpool/zfs_tools
ozmt-snapjobs-mod.sh rpool/ROOT/centos daily/7 weekly/4 monthly/6
ozmt-snapjobs-mod.sh rpool/home/root daily/7 weekly/4 monthly/6

    8. Add additional zfs cache

      Additional ZFS cache

      BASH 
      zpool add relaypool cache ssd1-part3

    9. Add additional swap space

      Setup swap space

      BASH 
      mkswap /dev/disk/by-vdev/ssd1-part4
echo "/dev/disk/by-vdev/ssd1-part4    swap                    swap    defaults        0 0" >> /etc/fstabswapon -afree
  7. Addition server configuration

    1. Setup email
      Preserve main.cf

      Setup email

      BASH 
      cd /etc/postfix
mv main.cf main.dist

      Create new main.cf.  Update as necessary per site.

      main.cf

      BASH 
      # See /usr/share/postfix/main.cf.dist for a commented, more complete version
smtpd_banner = $myhostname ESMTP $mail_name
biff = no
append_dot_mydomain = no
# this will add 'POP.yourdomain.tld' to the domain
#sender_canonical_maps = regexp:/etc/postfix/sender_regexp
# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = nrg.wustl.edu
relayhost = mail.nrg.wustl.edu
recipient_delimiter = +
inet_interfaces = 127.0.0.1
local_transport = error:local delivery is disabled

      Add email alias for root

      Setup email

      BASH 
      echo "root:           nrg-admin@nrg.wustl.edu" >> /etc/aliases
newaliases

      Create /etc/ozmt/reporting.muttrc Adjust as necessary.

      reporting.muttrc

      BASH 
      set realname="lifespan-relay1"
set hostname=lifespan-relay1.nrg.mir
set from="lifespan-relay1-no-reply@myrealdomain.com"
set use_envelope_from=yes
set ssl_use_sslv3=no
set ssl_use_tlsv1=no

      Set email_to in /etc/ozmt/config

      /etc/ozmt/config

      BASH 
      # Address to send reports to
email_to="nrg-admin@nrg.wustl.edu"

      Setup rpool backups

      rpool backup

      BASH 
      echo "

    2. Setup Tomcat for XNAT

      1.  Add xnat user

        XNAT user

        BASH 
        useradd -c "XNAT system user" -d /xnat/home -s /bin/false xnat

      2.  Fix up /xnat directories

        /xnat

        BASH 
        cd /xnat
mkdir -p logs/{catalina,xnat,tomcat} tmp/{catalina,xnat,tomcat} home/{config,plugins,work}
cd home
ln -s ../logs/xnat logs
ln -s ../tmp/xnat temp
cd ..
chmod -R g-rx,o-rx .
chown -R xnat .

      3. Fix up the symlinks in /usr/share/tomcat

        /usr/share/tomcat

        BASH 
        cd /usr/share/tomcat
rm -f temp logs
ln -s /xnat/tmp/tomcat temp
ln -s /xnat/logs/tomcat logs

      4. Create XNAT Tomcat service

        systemctl

        BASH 
        systemctl enable tomcat@xnat.service

      5. Fix up /etc/tomcat/server.xml
        Make the Host block match

        server.xml

        XML 
              <Host name="localhost"  appBase="webapps"
            unpackWARs="true" autoDeploy="true"
            xmlValidation="false" xmlNamespaceAware="false">
        <!-- SingleSignOn valve, share authentication between web applications
             Documentation at: /docs/config/valve.html -->
        <!--
        <Valve className="org.apache.catalina.authenticator.SingleSignOn" />
        -->
        <!-- Access log processes all example.
             Documentation at: /docs/config/valve.html
             Note: The pattern used is equivalent to using pattern="common" -->
        <!--
        <Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
               prefix="localhost_access_log." suffix=".txt"
               pattern="%h %l %u %t &quot;%r&quot; %s %b" />
        -->
      </Host>

      6. Modify /etc/sysconfig/tomcat

        /etc/sysconfig/tomcat

        BASH 
        # Service-specific configuration file for tomcat. This will be sourced by
# the SysV init script after the global configuration file
# /etc/tomcat/tomcat.conf, thus allowing values to be overridden in
# a per-service manner.
#
# NEVER change the init script itself. To change values for all services make
# your changes in /etc/tomcat/tomcat.conf
#
# To change values for a specific service make your edits here.
# To create a new service create a link from /etc/init.d/<your new service> to
# /etc/init.d/tomcat (do not copy the init script) and make a copy of the
# /etc/sysconfig/tomcat file to /etc/sysconfig/<your new service> and change
# the property values so the two services won't conflict. Register the new
# service in the system as usual (see chkconfig and similars).
#
# Where your java installation lives
#JAVA_HOME="/usr/lib/jvm/java"
# Where your tomcat installation lives
#CATALINA_BASE="/usr/share/tomcat"
CATALINA_HOME="/usr/share/tomcat"
#JASPER_HOME="/usr/share/tomcat"
CATALINA_TMPDIR="/xnat/tmp/catalina"
# You can pass some parameters to java here if you wish to
#JAVA_OPTS="-Xminf0.1 -Xmaxf0.3"
# Use JAVA_OPTS to set java.library.path for libtcnative.so
#JAVA_OPTS="-Djava.library.path=/usr/lib64"
JAVA_OPTS="-Xms872m -Xmx2620m -Xmn524m -XX:-OmitStackTraceInFastThrow -XX:MaxPermSize=256m -Dsun.net.inetaddr.ttl=30 -Dxnat.home=/xnat/home"
# What user should run tomcat
TOMCAT_USER="xnat"
# You can change your tomcat locale here
#LANG="en_US"
# Run tomcat under the Java Security Manager
SECURITY_MANAGER="false"
# Time to wait in seconds, before killing process
SHUTDOWN_WAIT="30"
# Whether to annoy the user with "attempting to shut down" messages or not
#SHUTDOWN_VERBOSE="false"
# Connector port is 8080 for this tomcat instance
#CONNECTOR_PORT="8080"
# If you wish to further customize your tomcat environment,
# put your own definitions here
# (i.e. LD_LIBRARY_PATH for some jdbc drivers)
TOMCAT_LOG="/xnat/logs/tomcat/catalina.out"
CATALINA_OPTS="-Xdebug -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000 -Dcatalina.ext.dirs=/usr/share/tomcat/shared/lib:/usr/share/tomcat/common/lib -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9004 -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false"

      7. Edit Tomcat systemd unit.  (Change the User line and disable OOM kill)

        systemctl edit --full tomcat.service

        tomcat@xnat.service

        TEXT 
        # Systemd unit file for tomcat instances.
#
# To create clones of this service:
# 0. systemctl enable tomcat@name.service
# 1. create catalina.base directory structure in
#    /var/lib/tomcats/name
# 2. profit.

[Unit]
Description=Apache Tomcat Web Application Container
After=syslog.target network.target


[Service]
Type=simple

EnvironmentFile=/etc/tomcat/tomcat.conf
Environment="NAME=%I"
EnvironmentFile=-/etc/sysconfig/tomcat@%I


ExecStart=/usr/libexec/tomcat/server start
ExecStop=/usr/libexec/tomcat/server stop
SuccessExitStatus=143
User=xnat
Group=tomcat
 
# Disable OOM kill on tomcat
OOMScoreAdjust=-1000

[Install]
WantedBy=multi-user.target
    3. Setup PostgreSQL

      1. Install PostgreSQL 

        PostgreSQL 9.4

        BASH 
        yum install -y https://download.postgresql.org/pub/repos/yum/9.4/redhat/rhel-7-x86_64/pgdg-centos94-9.4-3.noarch.rpm
yum install -y postgresql94-server

      2. Edit postgresql-9.4.service

        systemctl edit --full postgresql-9.4.service

        postgresql-9.4.service

        BASH 
        # It's not recommended to modify this file in-place, because it will be
# overwritten during package upgrades.  If you want to customize, the
# best way is to create a file "/etc/systemd/system/postgresql-9.4.service",
# containing
#       .include /lib/systemd/system/postgresql-9.4.service
#       ...make your changes here...
# For more info about custom unit files, see
# http://fedoraproject.org/wiki/Systemd#How_do_I_customize_a_unit_file.2F_add_a_custom_unit_file.3F


# Note: changing PGDATA will typically require adjusting SELinux
# configuration as well.


# Note: do not use a PGDATA pathname containing spaces, or you will
# break postgresql-setup.


[Unit]
Description=PostgreSQL 9.4 database server
After=syslog.target
After=network.target


[Service]
Type=forking


User=postgres
Group=postgres


# Note: avoid inserting whitespace in these Environment= lines, or you may
# break postgresql-setup.


# Location of database directory
Environment=PGDATA=/xnat/pgsql/9.4
Environment=PGLOG=/xnat/logs/pgsql/pgstartup-9.4.log

# Where to send early-startup messages from the server (before the logging
# options of postgresql.conf take effect)
# This is normally controlled by the global default set by systemd
# StandardOutput=syslog


# Disable OOM kill on the postmaster
OOMScoreAdjust=-1000


ExecStartPre=/usr/pgsql-9.4/bin/postgresql94-check-db-dir ${PGDATA}
ExecStart=/usr/pgsql-9.4/bin/pg_ctl start -D ${PGDATA} -s -w -t 300
ExecStop=/usr/pgsql-9.4/bin/pg_ctl stop -D ${PGDATA} -s -m fast
ExecReload=/usr/pgsql-9.4/bin/pg_ctl reload -D ${PGDATA} -s


# Give a reasonable amount of time for the server to start up/shut down
TimeoutSec=300


[Install]
WantedBy=multi-user.target

      3. Start Postgres for the first time

        Start Postgres

        BASH 
        cd /xnat/pgsql
chown postgres:postgres 9.4
chmod 755 /xnat
 
cd /xnat/logs
mkdir pgsql
chown postgres pgsql
 
cd
/usr/pgsql-9.4/bin/postgresql94-setup initdb
 
systemctl start postgresql-9.4.service

      4. Setup posgresql.conf

        cd /xnat/pgsql/9.4
        mv postgresql.conf postgresql.conf.dist

        postgresql.conf

        BASH 
        max_connections = 100
shared_buffers = 612MB
work_mem = 50MB
maintenance_work_mem = 256MB
dynamic_shared_memory_type = posix
archive_mode = off
effective_cache_size = 1225MB
log_destination = 'stderr'
logging_collector = on
log_directory = 'pg_log'
log_filename = 'postgresql-%a.log'
log_truncate_on_rotation = on
log_rotation_age = 1d
log_rotation_size = 0
log_min_duration_statement = 30000
log_line_prefix = '< %m >'
log_timezone = 'US/Central'
datestyle = 'iso, mdy'
timezone = 'US/Central'
lc_messages = 'en_US.UTF-8'
lc_monetary = 'en_US.UTF-8'
lc_numeric = 'en_US.UTF-8'
lc_time = 'en_US.UTF-8'
default_text_search_config = 'pg_catalog.english'
standard_conforming_strings = off

      5. Give 'postgres' user a password

        postgres user password

        BASH 
        su - postgres
psql -c "ALTER USER postgres with password '<put your postgres password here>'"
exit
      6. Setup pg_hba.conf

Update procedure:

Check the ZFS on Linux wiki for new information before proceeding:

https://github.com/zfsonlinux/zfs/wiki/RHEL-and-CentOS


Remove and re-install  zfs for the latest Centos release

CODE 
yum remove zfs zfs-kmod spl spl-kmod libzfs2 libnvpair1 libuutil1 libzpool2 zfs-release
yum install http://download.zfsonlinux.org/epel/zfs-release.el7_4.noarch.rpm
find /lib/modules/ \( -name "splat.ko" -or -name "zcommon.ko" \
	-or -name "zpios.ko" -or -name "spl.ko" -or -name "zavl.ko" -or \
	-name "zfs.ko" -or -name "znvpair.ko" -or -name "zunicode.ko" \) \
	-exec /bin/rm {} \;

Disable [zfs] and enable [zfs-kmod] in the zfs repo:

vim /etc/yum.repos.d/zfs.repo

CODE 
[zfs]
name=ZFS on Linux for EL7 - dkms
baseurl=http://download.zfsonlinux.org/epel/7.4/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-kmod]
name=ZFS on Linux for EL7 - kmod
baseurl=http://download.zfsonlinux.org/epel/7.4/kmod/$basearch/
enabled=1
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-source]
name=ZFS on Linux for EL7 - Source
baseurl=http://download.zfsonlinux.org/epel/7.4/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing]
name=ZFS on Linux for EL7 - dkms - Testing
baseurl=http://download.zfsonlinux.org/epel-testing/7.4/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing-kmod]
name=ZFS on Linux for EL7 - kmod - Testing
baseurl=http://download.zfsonlinux.org/epel-testing/7.4/kmod/$basearch/
enabled=0
metadata_expire=7d
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux

[zfs-testing-source]
name=ZFS on Linux for EL7 - Testing Source
baseurl=http://download.zfsonlinux.org/epel-testing/7.4/SRPMS/
enabled=0
gpgcheck=1
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-zfsonlinux


Reinstall ZFS:

CODE 
yum autoremove
yum install zfs zfs-dracut
systemctl preset zfs-import-cache zfs-import-scan zfs-mount zfs-share zfs-zed zfs.target


# Do the system update
yum update

# Re-enable services
systemctl enable zfs-import-cache
systemctl enable zfs-import-scan
systemctl enable zfs-mount
systemctl enable zfs-share
systemctl enable zfs-zed
systemctl enable zfs.target

Make the lastest kernel the default in grub:

CODE 
grep '^menuentry' /boot/grub2/grub.cfg
vim /etc/default/grub
grub2-mkconfig -o /boot/grub2/grub.cfg


TODO:

Setup Nagios Monitoring:

http://www.admin-magazine.com/Archive/2014/22/Nagios-Passive-Checks 

References

https://github.com/zfsonlinux/zfs/wiki/RHEL-%26-CentOS

https://github.com/zfsonlinux/pkg-zfs/wiki/HOWTO-install-EL7-(CentOS-RHEL)-to-a-Native-ZFS-Root-Filesystem

https://github.com/zfsonlinux/zfs/wiki/Ubuntu%2016.04%20Root%20on%20ZFS

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