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If selinux is enabled and at its default configuration during the NMIS installation perl modules will be installed with the wrong path. This will cause NMIS to be non-functional. |
Procedure
Prepare Target CentOS 7 Server
1) Install prerequisite packages
After installing CentOS 7 on the new server install the following packages.:
- yum update
- yum install perl
- yum install perl-core
- yum install rrdtool
- yum install rrdtool-perl
- yum install libpng12
- yum install rsync
- yum install ntp
...
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yum update yum install -y perl perl-core rrdtool rrdtool-perl libpng12 rsync ntp |
2) Install NMIS and OMK Applications
Install the correct NMIS and OMK application versions on the new CentOS 7 server. If you no longer have the installer packages for the correct versions contact support@opmantek.com and someone will provide them.
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#!/bin/bash
upgrade_list=$(</installs/omk8_list.txt)
echo "starting downloads based on upgrade_list"
sleep 2
while read LINE; do `wget ${LINE}`; done < /installs/omk8_list.txt
echo "Downloads complete"
sleep 2
echo "##########"
echo "#"
echo "# Starting installs"
echo "#"
echo "##########"
while IFS=/ read -r var1 var2 var3 var4 var5; do
#echo $var1
#echo $var2
#echo $var3
echo "Running install on $var4"
`sh ./$var4 -- -y`
sleep 2
#echo $var5
done < /installs/omk8_list.txt
echo "##########"
echo "#"
echo "# Installs Complete"
echo "#"
echo "##########" |
3) Install SSH Keys
In order for the export script to work a valid ssh key must be installed in the /root/.ssh/authorized_keys file.
- Does Current server have valid key? cat ~/.ssh/id_rsa.pub
- If yes copy "ssh-copy-id -i ~/.ssh/authorized_keys user@host
- If no create ssh key then run ssh-copy-id command from above
4) Shutdown Related Services
- On both the old CentOS 6 and the new CentOS 7 servers shutdown the following services:
- opeventsd
- opchartsd
- opconfigd
- opflowd
- omkd
- mongod
...
5) Edit /etc/cron.d/nmis and comment out all cron jobs
- This should performed on both servers before running the script.
6) Run Export Script
Run the following script on the old CentOS 6 server. The following six variables at the top of the script will need to be modified to suit your environment.
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#!/bin/sh
TARGET=192.168.10.67
NODEDATA=/usr/local/nmis8/database/nodes
SOURCE_MONGODBLOCATION=/data
SOURCE_MONGODBDIR=mongodb
DESTINATION_MONGODBLOCATION=/var/lib
DESTINATION_MONGODBDIR=mongo
NODES=$(fgrep "'name'" /usr/local/nmis8/conf/Nodes.nmis | awk '{print $3}' | tr "\'" ' ' | tr ',' ' ' | awk '{print $1}')
# copy mongodb
rsync --progress -av $SOURCE_MONGODBLOCATION/$SOURCE_MONGODBDIR $TARGET:$DESTINATION_MONGODBLOCATION/.
ssh $TARGET "chown -R mongod:mongod $DESTINATION_MONGODBLOCATION/$DESTINATION_MONGODBDIR"
for NODE in $NODES
do
# create a directory to store the node export JSON files.
install -d $NODEDATA
# export the node records from NMIS
/usr/local/nmis8/admin/node_admin.pl act=export node=$NODE file=$NODEDATA/$NODE.json
# get the node data to the target server
rsync -avz -e ssh $NODEDATA/* $TARGET:$NODEDATA/
rsync -avz -e ssh /usr/local/nmis8/database/nodes/$NODE $TARGET:/usr/local/nmis8/database/nodes
scp /usr/local/nmis8/var/$NODE* $TARGET:/usr/local/nmis8/var
# remotely add the nodes to the TARGET server
ssh -t $TARGET "/usr/local/nmis8/admin/node_admin.pl act=create node=$NODE file=$NODEDATA/$NODE.json"
done
# Update the group list with any new groups
ssh -t $TARGET "/usr/local/nmis8/admin/grouplist.pl patch=true"
# copy NMIS/OMK config
rsync --progress -av /usr/local/nmis8/models root@$TARGET:/usr/local/nmis8/.
rsync --progress -av /usr/local/nmis8/conf root@$TARGET:/usr/local/nmis8/.
rsync --progress -av /usr/local/omk/conf root@$TARGET:/usr/local/omk/.
# Fix file permissions
ssh $TARGET /usr/local/nmis8/admin/fixperms.pl |
7) Update your Mongo Config File on the New CentOS 7 Server
Update your /etc/mongod.conf to reflect the current configuration from your old CentOS 6 Server, note that the dbpath could be different from your old environment.
8) Correct NMIS Hostname on the New CentOS 7 Server
In /usr/local/nmis8/conf put the correct hostname for 'server_name' attribute.
9) Restart Related Services on the New CentOS 7 Server
Restart the following services:
- mongod
- omkd
- opeventsd
- opconfigd
- opflowd
- opchartsd
10) Verification
Log into the GUI on the new CentOS 7 server and verify each application is functional and presents data from before the migration.