Arbiter Poller is name given to a Poller which hosts
Mongodb which acts as a Arbiter to the Primary and Secondary Mongodbs
Nats: Third node of the Nats distributed setup.
This involves changes to distributed Mongodb and Nats configuration and opCommon.json that needs to be updated accordingly.
Procudure:
All vms: (Main Pri, Sec Pri, Pollers, Mirrors)
sudo systemctl stop ophad
Main Primary: Delete all streams
nats stream delete --user omkadmin --password op42opha42
If jq is installed on Main Primary:
for stream_name in $(nats stream list --user omkadmin --password op42opha42 --json | jq -r '.[]'); do nats stream info --user omkadmin --password op42opha42 "$stream_name"; done
Skip the optional step to cleanup the Nats storage /opt/data/nats if not needed.
All vms: (Main Pri, Sec Pri, Pollers, Mirrors)
Edit /usr/local/omk/conf/opCommon.json
omkadmin@lab-ophamb-mp01:/usr/local/omk/conf$ grep -a4 nats_cluster /usr/local/omk/conf/opCommon.json "db_use_v26_features" : 1, "redis_port" : 6379, "redis_server" : "localhost", "db_port" : "27017", "nats_cluster" : [ “Main Primary , “Sec Primary”, “New Arbiter Poller” ],
Restart the services for the changes made to opCommon.json to get reflected.
sudo systemctl restart omkd opeventsd opchartsd
All vms: (Main Pri, Sec Pri, Pollers, Mirrors)
sudo systemctl start ophad
Ophad verify
/usr/local/omk/bin/ophad verify
Check to see if nats jetstream has been created
nats stream list --user omkadmin --password op42opha42
Main Primary : mongosh (https://www.mongodb.com/docs/manual/tutorial/replace-replica-set-member/ )
mongosh --username opUserRW --password op42flow42 admin --port 27017 rs1 [direct: primary] admin> cfg = rs.conf() rs1 [direct: primary] admin> cfg.members[2].host = "opha-dev6.opmantek.net:27018" rs1 [direct: primary] admin> rs.reconfig(cfg) rs1 [direct: primary] admin> rs.conf()
Also, need to check if the Priority on Main Primary and Secondary Primary
members: [
{
_id: 0,
host: 'opha-dev4.opmantek.net:27017',
priority: 2,
},
{
_id: 1,
host: 'opha-dev7.opmantek.net:27017',
priority: 1,
},
{
_id: 2,
host: 'opha-dev6.opmantek.net:27018',
priority: 0,
}
],
Optional step 3 to cleanup Nats storage /opt/nats/storage
Main Pri, Sec Pri and Poller (all 3 servers where nats has been running)
sudo systemctl stop nats-server
3a. If cleanup of /opt/nats/storage/jetstream is required
rm -rf /opt/nats/storage
3b. Main Pri, Sec Pri and Poller (all 3 servers where nats has been running)
sudo systemctl start nats-server