This content originally appeared on DEV Community and was authored by Duc Tran
## MongoDB Cluster on Docker
A simple implement MongoDB Cluster on Docker with PSS Style (Primary - Secondary - Secondary). Inspired by this article
Source code in here
Components
-
2 Mongos (router): The mongos acts as query routers, providing an interface
between client applications and the sharded cluster.
router01router02
-
3 Config Servers: Store metadata and configuration settings for the cluster
configsvr01configsvr02configsvr03
-
3 Shards (each a 3 member replica set): Each shard contains a subset of
the sharded data. Each shard can be deployed as a replica set.
-
shard01-a,shard01-b,shard01-c -
shard02-a,shard02-b,shard02-c -
shard03-a,shard03-b,shard03-c
-
Installation
Clone this repo:
git clone https://github.com/ductnn/mongodb-cluster-docker.git
cd mongodb-cluster-docker
And run docker-compose.yaml:
➜ mongodb-cluster-docker git:(master) ✗ docker-compose up -d
Creating network "mongodb-cluster-docker_default" with the default driver
Pulling router01 (mongo:5.0.3)...
5.0.3: Pulling from library/mongo
7b1a6ab2e44d: Already exists
90eb44ebc60b: Already exists
5085b59f2efb: Already exists
c7499923d022: Already exists
019496b6c44a: Already exists
c0df4f407f69: Already exists
351daa315b6c: Already exists
557b07ecd9d7: Already exists
a2dff157a5e3: Already exists
07d83e88231b: Already exists
Digest: sha256:07212fb304ea36b8c5a9e5694527f16deeb0b99f87fc60162dc15ab260bf8a2a
Status: Downloaded newer image for mongo:5.0.3
Creating shard-02-node-b ... done
Creating shard-03-node-b ... done
Creating shard-03-node-c ... done
Creating shard-02-node-c ... done
Creating router-01 ... done
Creating shard-01-node-b ... done
Creating shard-01-node-c ... done
Creating shard-03-node-a ... done
Creating shard-01-node-a ... done
Creating shard-02-node-a ... done
Creating router-02 ... done
Creating mongo-config-01 ... done
Creating mongo-config-02 ... done
Creating mongo-config-03 ... done
Result:
➜ mongodb-cluster-docker git:(master) ✗ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
302243ef45a3 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 15 minutes 0.0.0.0:27121->27017/tcp, :::27121->27017/tcp mongo-config-03
4599103daf74 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27120->27017/tcp, :::27120->27017/tcp mongo-config-02
5be686736dd8 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27119->27017/tcp, :::27119->27017/tcp mongo-config-01
4eff0c607d3c mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27118->27017/tcp, :::27118->27017/tcp router-02
b28d39a0a262 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27125->27017/tcp, :::27125->27017/tcp shard-02-node-a
ad9c4985f630 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27122->27017/tcp, :::27122->27017/tcp shard-01-node-a
5a43e22ff9ae mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27128->27017/tcp, :::27128->27017/tcp shard-03-node-a
52520b1b29a9 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27124->27017/tcp, :::27124->27017/tcp shard-01-node-c
9591f85f2dc0 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27130->27017/tcp, :::27130->27017/tcp shard-03-node-c
1b745802b88a mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27126->27017/tcp, :::27126->27017/tcp shard-02-node-b
161baac14972 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27117->27017/tcp, :::27117->27017/tcp router-01
4468e7f23da1 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27123->27017/tcp, :::27123->27017/tcp shard-01-node-b
1b99d3d5ea54 mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27129->27017/tcp, :::27129->27017/tcp shard-03-node-b
0480f8b2247d mongo:5.0.3 "docker-entrypoint.s…" 16 minutes ago Up 16 minutes 0.0.0.0:27127->27017/tcp, :::27127->27017/tcp shard-02-node-c
Then, we need to init config-servers, shards and router:
Config servers
# Initilizing the config server
➜ mongodb-cluster-docker git:(master) ✗ bash bash/init-configserver.sh
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("555e23b7-f1bd-4232-9947-8f5dd0db6c3b") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
{
"ok" : 1,
"$gleStats" : {
"lastOpTime" : Timestamp(1636305337, 1),
"electionId" : ObjectId("000000000000000000000000")
},
"lastCommittedOpTime" : Timestamp(0, 0)
}
bye
Shards
# Initilzing the shards
➜ mongodb-cluster-docker git:(master) ✗ bash bash/init-replicaset.sh
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("815f9a5c-997b-48a6-bba0-8847b0890521") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1636305394, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636305394, 1)
}
bye
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("16424801-e037-450b-b4db-4d9dfe19752b") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
{ "ok" : 1 }
bye
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("6f621971-1d81-45c6-9f74-23eacc9cc4a1") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
{
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1636305395, 1),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636305395, 1)
}
bye
Routers
After initilizing config-server and shards, wait a bit to to elect primaries
before initilizing router:
➜ mongodb-cluster-docker git:(master) ✗ bash bash/init-router.sh
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("25a1c2a2-135c-4550-b732-713e018eb0a2") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
{
"shardAdded" : "rs-shard-01",
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1636305656, 6),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636305656, 5)
}
{
"shardAdded" : "rs-shard-02",
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1636305660, 2),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636305658, 4)
}
{
"shardAdded" : "rs-shard-03",
"ok" : 1,
"$clusterTime" : {
"clusterTime" : Timestamp(1636305662, 9),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636305662, 3)
}
bye
Verify status
We can check the status of replicasets:
# Exec to the shard
➜ mongodb-cluster-docker git:(master) ✗ docker exec -it shard-01-node-a bash
root@ad9c4985f630:/# mongo
rs-shard-01:PRIMARY> rs.status()
{
"set" : "rs-shard-01",
"date" : ISODate("2021-11-07T17:31:01.326Z"),
"myState" : 1,
"term" : NumberLong(1),
"syncSourceHost" : "",
"syncSourceId" : -1,
"heartbeatIntervalMillis" : NumberLong(2000),
"majorityVoteCount" : 2,
"writeMajorityCount" : 2,
"votingMembersCount" : 3,
"writableVotingMembersCount" : 3,
"optimes" : {
"lastCommittedOpTime" : {
"ts" : Timestamp(1636306261, 9),
"t" : NumberLong(1)
},
"lastCommittedWallTime" : ISODate("2021-11-07T17:31:01.283Z"),
"readConcernMajorityOpTime" : {
"ts" : Timestamp(1636306261, 9),
"t" : NumberLong(1)
},
"appliedOpTime" : {
"ts" : Timestamp(1636306261, 9),
"t" : NumberLong(1)
},
"durableOpTime" : {
"ts" : Timestamp(1636306261, 8),
"t" : NumberLong(1)
},
"lastAppliedWallTime" : ISODate("2021-11-07T17:31:01.283Z"),
"lastDurableWallTime" : ISODate("2021-11-07T17:31:01.278Z")
},
"lastStableRecoveryTimestamp" : Timestamp(1636306245, 14),
"electionCandidateMetrics" : {
"lastElectionReason" : "electionTimeout",
"lastElectionDate" : ISODate("2021-11-07T17:16:45.266Z"),
"electionTerm" : NumberLong(1),
"lastCommittedOpTimeAtElection" : {
"ts" : Timestamp(0, 0),
"t" : NumberLong(-1)
},
"lastSeenOpTimeAtElection" : {
"ts" : Timestamp(1636305394, 1),
"t" : NumberLong(-1)
},
"numVotesNeeded" : 2,
"priorityAtElection" : 1,
"electionTimeoutMillis" : NumberLong(10000),
"numCatchUpOps" : NumberLong(0),
"newTermStartDate" : ISODate("2021-11-07T17:16:45.299Z"),
"wMajorityWriteAvailabilityDate" : ISODate("2021-11-07T17:16:45.957Z")
},
"members" : [
{
"_id" : 0,
"name" : "shard01-a:27017",
"health" : 1,
"state" : 1,
"stateStr" : "PRIMARY",
"uptime" : 1211,
"optime" : {
"ts" : Timestamp(1636306261, 9),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-11-07T17:31:01Z"),
"syncSourceHost" : "",
"syncSourceId" : -1,
"infoMessage" : "",
"electionTime" : Timestamp(1636305405, 1),
"electionDate" : ISODate("2021-11-07T17:16:45Z"),
"configVersion" : 2,
"configTerm" : 1,
"self" : true,
"lastHeartbeatMessage" : ""
},
{
"_id" : 1,
"name" : "shard01-b:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 867,
"optime" : {
"ts" : Timestamp(1636306260, 9),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1636306260, 9),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-11-07T17:31:00Z"),
"optimeDurableDate" : ISODate("2021-11-07T17:31:00Z"),
"lastHeartbeat" : ISODate("2021-11-07T17:31:01.263Z"),
"lastHeartbeatRecv" : ISODate("2021-11-07T17:31:01.252Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncSourceHost" : "shard01-a:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 2,
"configTerm" : 1
},
{
"_id" : 2,
"name" : "shard01-c:27017",
"health" : 1,
"state" : 2,
"stateStr" : "SECONDARY",
"uptime" : 867,
"optime" : {
"ts" : Timestamp(1636306260, 9),
"t" : NumberLong(1)
},
"optimeDurable" : {
"ts" : Timestamp(1636306260, 9),
"t" : NumberLong(1)
},
"optimeDate" : ISODate("2021-11-07T17:31:00Z"),
"optimeDurableDate" : ISODate("2021-11-07T17:31:00Z"),
"lastHeartbeat" : ISODate("2021-11-07T17:31:01.263Z"),
"lastHeartbeatRecv" : ISODate("2021-11-07T17:31:01.248Z"),
"pingMs" : NumberLong(0),
"lastHeartbeatMessage" : "",
"syncSourceHost" : "shard01-a:27017",
"syncSourceId" : 0,
"infoMessage" : "",
"configVersion" : 2,
"configTerm" : 1
}
],
"ok" : 1,
"$gleStats" : {
"lastOpTime" : Timestamp(0, 0),
"electionId" : ObjectId("7fffffff0000000000000001")
},
"lastCommittedOpTime" : Timestamp(1636306261, 9),
"$configServerState" : {
"opTime" : {
"ts" : Timestamp(1636306261, 11),
"t" : NumberLong(-1)
}
},
"$clusterTime" : {
"clusterTime" : Timestamp(1636306261, 11),
"signature" : {
"hash" : BinData(0,"AAAAAAAAAAAAAAAAAAAAAAAAAAA="),
"keyId" : NumberLong(0)
}
},
"operationTime" : Timestamp(1636306261, 9)
}
Similar with another shards. Check the status of router:
➜ mongodb-cluster-docker git:(master) ✗ docker-compose exec router01 mongo --port 27017
MongoDB shell version v5.0.3
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("69408b5a-d313-44ae-ae64-81e9d3d21588") }
MongoDB server version: 5.0.3
================
Warning: the "mongo" shell has been superseded by "mongosh",
which delivers improved usability and compatibility.The "mongo" shell has been deprecated and will be removed in
an upcoming release.
We recommend you begin using "mongosh".
For installation instructions, see
https://docs.mongodb.com/mongodb-shell/install/
================
---
The server generated these startup warnings when booting:
2021-11-07T17:10:47.048+00:00: Access control is not enabled for the database. Read and write access to data and configuration is unrestricted
---
mongos> sh.status()
--- Sharding Status ---
sharding version: {
"_id" : 1,
"minCompatibleVersion" : 5,
"currentVersion" : 6,
"clusterId" : ObjectId("618809c41517a9e726602e13")
}
shards:
{ "_id" : "rs-shard-01", "host" : "rs-shard-01/shard01-a:27017,shard01-b:27017,shard01-c:27017", "state" : 1, "topologyTime" : Timestamp(1636305656, 2) }
{ "_id" : "rs-shard-02", "host" : "rs-shard-02/shard02-a:27017,shard02-b:27017,shard02-c:27017", "state" : 1, "topologyTime" : Timestamp(1636305658, 2) }
{ "_id" : "rs-shard-03", "host" : "rs-shard-03/shard03-a:27017,shard03-b:27017,shard03-c:27017", "state" : 1, "topologyTime" : Timestamp(1636305662, 1) }
active mongoses:
"5.0.3" : 2
autosplit:
Currently enabled: yes
balancer:
Currently enabled: yes
Currently running: yes
Collections with active migrations:
config.system.sessions started at Sun Nov 07 2021 17:33:54 GMT+0000 (UTC)
Failed balancer rounds in last 5 attempts: 0
Migration results for the last 24 hours:
237 : Success
databases:
{ "_id" : "config", "primary" : "config", "partitioned" : true }
config.system.sessions
shard key: { "_id" : 1 }
unique: false
balancing: true
chunks:
rs-shard-01 787
rs-shard-02 118
rs-shard-03 119
too many chunks to print, use verbose if you want to force print
Done ... wait. You can remove all:
➜ mongodb-cluster-docker git:(master) bash clean_all.sh
Stopping mongo-config-03 ... done
Stopping mongo-config-02 ... done
Stopping mongo-config-01 ... done
Stopping router-02 ... done
Stopping shard-02-node-a ... done
Stopping shard-01-node-a ... done
Stopping shard-03-node-a ... done
Stopping shard-01-node-c ... done
Stopping shard-03-node-c ... done
Stopping shard-02-node-b ... done
Stopping router-01 ... done
Stopping shard-01-node-b ... done
Stopping shard-03-node-b ... done
Stopping shard-02-node-c ... done
Removing mongo-config-03 ... done
Removing mongo-config-02 ... done
Removing mongo-config-01 ... done
Removing router-02 ... done
Removing shard-02-node-a ... done
Removing shard-01-node-a ... done
Removing shard-03-node-a ... done
Removing shard-01-node-c ... done
Removing shard-03-node-c ... done
Removing shard-02-node-b ... done
Removing router-01 ... done
Removing shard-01-node-b ... done
Removing shard-03-node-b ... done
Removing shard-02-node-c ... done
Removing network mongodb-cluster-docker_default
Removing image mongo:5.0.3
And so real done =))))
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Contribution
All contributions are welcomed in this project!
License
The MIT License (MIT). Please see LICENSE for more information.
This content originally appeared on DEV Community and was authored by Duc Tran
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Duc Tran | Sciencx (2022-01-28T17:40:26+00:00) MongoDB cluster on Docker. Retrieved from https://www.scien.cx/2022/01/28/mongodb-cluster-on-docker/
" » MongoDB cluster on Docker." Duc Tran | Sciencx - Friday January 28, 2022, https://www.scien.cx/2022/01/28/mongodb-cluster-on-docker/
HARVARDDuc Tran | Sciencx Friday January 28, 2022 » MongoDB cluster on Docker., viewed ,<https://www.scien.cx/2022/01/28/mongodb-cluster-on-docker/>
VANCOUVERDuc Tran | Sciencx - » MongoDB cluster on Docker. [Internet]. [Accessed ]. Available from: https://www.scien.cx/2022/01/28/mongodb-cluster-on-docker/
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