Given a Docker Swarm, will start up 3 Mongo DB instances sharing a replica set.
Based on @lucjuggery's https://medium.com/lucjuggery/mongodb-replica-set-on-swarm-mode-45d66bc9245 but updated for v3 Compose syntax.
- Build the
mongorsimage:
$ docker-compose build
WARNING: Some services (rs) use the 'deploy' key, which will be ignored. Compose does not support 'deploy' configuration - use `docker stack deploy` to deploy to a swarm.
rs1 uses an image, skipping
rs2 uses an image, skipping
rs3 uses an image, skipping
Building rs
Step 1/5 : FROM mongo:3.2
---> f2b4f7eadfd2
Step 2/5 : COPY init.sh /tmp/init.sh
---> Using cache
---> 5a02bbaf1db5
Step 3/5 : RUN chmod +x /tmp/init.sh
---> Using cache
---> e143322f615c
Step 4/5 : LABEL maintainer="Eric Smalling <smalls@docker.com>"
---> Running in fddadee5ab63
Removing intermediate container fddadee5ab63
---> 325bfed426b0
Step 5/5 : CMD /tmp/init.sh
---> Running in 7e27035f1f8a
Removing intermediate container 7e27035f1f8a
---> d4962824f7cb
Successfully built d4962824f7cb
Successfully tagged ericsmalling/mongors:3.4
- Deploy the stack:
$ docker stack deploy -c docker-compose.yml db
Ignoring unsupported options: build
Creating network db_mongo
Creating service db_rs2
Creating service db_rs3
Creating service db_rs
Creating service db_rs1
- Check state of services:
$ docker service ls
ID NAME MODE REPLICAS IMAGE PORTS
jnbd0m27pfni db_rs replicated 0/1 ericsmalling/mongors:3.4
58r9k9pp4el2 db_rs1 replicated 1/1 mongo:3.4
lb6rnp9icrdt db_rs2 replicated 1/1 mongo:3.4
fb0xaw2ftcop db_rs3 replicated 1/1 mongo:3.4
The db_rs service will try to run several times waiting for the other services
to finish starting. The last run should succeed, check with the following and the last (top-most) attempt should have a Complete state:
$ docker service ps db_rs
ID NAME IMAGE NODE DESIRED STATE CURRENT STATE ERROR PORTS
etwghr495vzn db_rs.1 ericsmalling/mongors:3.4 linuxkit-025000000001 Shutdown Complete 42 seconds ago
b0mfdypyqkph \_ db_rs.1 ericsmalling/mongors:3.4 linuxkit-025000000001 Shutdown Failed 49 seconds ago "task: non-zero exit (1)"
Additional verification (substitute the correct container name/hash in your environment):
$ docker exec -it db_rs1.1.iwokdgch5bud3tihaqd6484li mongo
MongoDB shell version v3.4.16
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.16
Welcome to the MongoDB shell.
For interactive help, type "help".
For more comprehensive documentation, see
http://docs.mongodb.org/
Questions? Try the support group
http://groups.google.com/group/mongodb-user
Server has startup warnings:
2018-07-20T00:27:38.874+0000 I STORAGE [initandlisten]
2018-07-20T00:27:38.874+0000 I STORAGE [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2018-07-20T00:27:38.874+0000 I STORAGE [initandlisten] ** See http://dochub.mongodb.org/core/prodnotes-filesystem
2018-07-20T00:27:38.904+0000 I CONTROL [initandlisten]
2018-07-20T00:27:38.904+0000 I CONTROL [initandlisten] ** WARNING: Access control is not enabled for the database.
2018-07-20T00:27:38.904+0000 I CONTROL [initandlisten] ** Read and write access to data and configuration is unrestricted.
2018-07-20T00:27:38.904+0000 I CONTROL [initandlisten]
rs0:PRIMARY> rs.status()
{
"set" : "rs0",
"date" : ISODate("2018-07-20T00:44:17.877Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1532047457, 1),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1532047457, 1),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1532047457, 1),
"t" : NumberLong(1)
}
},
"members" : [
{
"_id" : 0,
"name" : "rs1:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 999,
"optime" : {
"ts" : Timestamp(1532047457, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-20T00:44:17Z"),
"syncingTo" : "",
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1532046476, 1),
"electionDate" : ISODate("2018-07-20T00:27:56Z"),
"configVersion" : 1,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "rs2:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 992,
"optime" : {
"ts" : Timestamp(1532047447, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1532047447, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-20T00:44:07Z"),
"optimeDurableDate" : ISODate("2018-07-20T00:44:07Z"),
"lastHeartbeat" : ISODate("2018-07-20T00:44:16.645Z"),
"lastHeartbeatRecv" : ISODate("2018-07-20T00:44:16.957Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "rs3:27017",
"syncSourceHost" : "rs3:27017",
"syncSourceId" : 2,
"infoMessage" : "",
"configVersion" : 1
},
{
"_id" : 2,
"name" : "rs3:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 992,
"optime" : {
"ts" : Timestamp(1532047447, 1),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1532047447, 1),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2018-07-20T00:44:07Z"),
"optimeDurableDate" : ISODate("2018-07-20T00:44:07Z"),
"lastHeartbeat" : ISODate("2018-07-20T00:44:16.645Z"),
"lastHeartbeatRecv" : ISODate("2018-07-20T00:44:16.956Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncingTo" : "rs1:27017",
"syncSourceHost" : "rs1:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 1
}
],
"ok" : 1
}
- Shut it all down:
$ docker stack rm db
Removing service db_rs
Removing service db_rs1
Removing service db_rs2
Removing service db_rs3
Removing network db_mongo