oookli · March 21, 2021 15:04 · May 19, 2020 · May 19, 2020 · Aug 14, 2019 · Jul 5, 2019
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -6,7 +6,7 @@
       default:
     volumes:
       - ./scripts:/scripts
-    entrypoint: [ "/scripts/setup.sh" ]
+    entrypoint: [ "/scripts/setup.sh" ] # Make sure this file exists (see below for the setup.sh)
     depends_on:
       - mongo1
       - mongo2

diff --git a/docker.sh b/docker.sh
@@ -1,3 +1,6 @@
+# NOTE: This is the simplest way of achieving a replicaset in mongodb with Docker.
+# However if you would like a more automated approach, please see the setup.sh file and the docker-compose file which includes this startup script.
+
 # run this after setting up the docker-compose This will instantiate the replica set.
 # The id and hostname's can be tailored to your liking, however they MUST match the docker-compose file above.
 docker-compose up -d

diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,3 +1,17 @@
+  mongo-setup:
+    container_name: mongo-setup
+    image: mongo
+    restart: on-failure
+    networks:
+      default:
+    volumes:
+      - ./scripts:/scripts
+    entrypoint: [ "/scripts/setup.sh" ]
+    depends_on:
+      - mongo1
+      - mongo2
+      - mongo3
+
   mongo1:
     hostname: mongo1
     container_name: localmongo1
@@ -7,9 +21,10 @@
     ports:
       - 27017:27017
     restart: always
-    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0", "--journal", "--dbpath", "/data/db", "--enableMajorityReadConcern", "false" ]
     volumes:
-      - <VOLUME-DIR>:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
+      - <VOLUME-DIR>/mongo/data1/db:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
+      - <VOLUME-DIR>/mongo/data1/configdb:/data/configdb
   mongo2:
     hostname: mongo2
     container_name: localmongo2
@@ -19,7 +34,10 @@
     ports:
       - 27018:27017
     restart: always
-    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0", "--journal", "--dbpath", "/data/db", "--enableMajorityReadConcern", "false" ]
+    volumes:
+      - <VOLUME-DIR>/mongo/data2/db:/data/db # Note the data2, it must be different to the original set.
+      - <VOLUME-DIR>/mongo/data2/configdb:/data/configdb
   mongo3:
     hostname: mongo3
     container_name: localmongo3
@@ -29,4 +47,7 @@
     ports:
       - 27019:27017
     restart: always
-    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0", "--journal", "--dbpath", "/data/db", "--enableMajorityReadConcern", "false" ]
+    volumes:
+      - <VOLUME-DIR>/mongo/data3/db:/data/db
+      - <VOLUME-DIR>/mongo/data3/configdb:/data/configdb
diff --git a/setup.sh b/setup.sh
@@ -0,0 +1,51 @@
+#!/bin/bash
+
+#MONGODB1=`ping -c 1 mongo1 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1`
+#MONGODB2=`ping -c 1 mongo2 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1`
+#MONGODB3=`ping -c 1 mongo3 | head -1  | cut -d "(" -f 2 | cut -d ")" -f 1`
+
+MONGODB1=mongo1
+MONGODB2=mongo2
+MONGODB3=mongo3
+
+echo "**********************************************" ${MONGODB1}
+echo "Waiting for startup.."
+until curl http://${MONGODB1}:27017/serverStatus\?text\=1 2>&1 | grep uptime | head -1; do
+  printf '.'
+  sleep 1
+done
+
+# echo curl http://${MONGODB1}:28017/serverStatus\?text\=1 2>&1 | grep uptime | head -1
+# echo "Started.."
+
+
+echo SETUP.sh time now: `date +"%T" `
+mongo --host ${MONGODB1}:27017 <<EOF
+var cfg = {
+    "_id": "rs0",
+    "protocolVersion": 1,
+    "version": 1,
+    "members": [
+        {
+            "_id": 0,
+            "host": "${MONGODB1}:27017",
+            "priority": 2
+        },
+        {
+            "_id": 1,
+            "host": "${MONGODB2}:27017",
+            "priority": 0
+        },
+        {
+            "_id": 2,
+            "host": "${MONGODB3}:27017",
+            "priority": 0
+        }
+    ],settings: {chainingAllowed: true}
+};
+rs.initiate(cfg, { force: true });
+rs.reconfig(cfg, { force: true });
+rs.slaveOk();
+db.getMongo().setReadPref('nearest');
+db.getMongo().setSlaveOk(); 
+EOF
diff --git a/docker.sh b/docker.sh
@@ -9,7 +9,7 @@ rs.initiate(
     members: [
       { _id : 0, host : "mongo1:27017" },
       { _id : 1, host : "mongo2:27017" },
-      { _id : 2, host : "mongo3:27017" }
+      { _id : 2, host : "mongo3:27017", arbiterOnly: true }
     ]
   }
 )

diff --git a/docker-compose.yml b/docker-compose.yml
@@ -1,15 +1,15 @@
-mongo1:
-  hostname: mongo1
-  container_name: localmongo1
-  image: mongo
-  expose:
-    - 27017
-  ports:
-    - 27017:27017
-  restart: always
-  entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
-  volumes:
-    - <VOLUME-DIR>:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
+  mongo1:
+    hostname: mongo1
+    container_name: localmongo1
+    image: mongo
+    expose:
+      - 27017
+    ports:
+      - 27017:27017
+    restart: always
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+    volumes:
+      - <VOLUME-DIR>:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
   mongo2:
     hostname: mongo2
     container_name: localmongo2

diff --git a/credits.md → ...godb-replica-set-docker-compose-readme.md b/credits.md → ...godb-replica-set-docker-compose-readme.md
diff --git a/credits.md b/credits.md
@@ -4,4 +4,4 @@ This will guide you through setting up a replica set in a docker environment usi
 - Mongoose
 - Mongoose Transactions
 
-Thanks to https://gist.github.com/asoorm for helping with his docker-compose file!
+Thanks to https://gist.github.com/asoorm for helping with their docker-compose file!
diff --git a/credits.md b/credits.md
@@ -3,4 +3,5 @@ This will guide you through setting up a replica set in a docker environment usi
 - MongoDB Replica Sets
 - Mongoose
 - Mongoose Transactions
+
 Thanks to https://gist.github.com/asoorm for helping with his docker-compose file!
diff --git a/credits.md b/credits.md
@@ -1 +1,6 @@
+This will guide you through setting up a replica set in a docker environment using.
+- Docker Compose
+- MongoDB Replica Sets
+- Mongoose
+- Mongoose Transactions
 Thanks to https://gist.github.com/asoorm for helping with his docker-compose file!
diff --git a/credits.md b/credits.md
@@ -0,0 +1 @@
+Thanks to https://gist.github.com/asoorm for helping with his docker-compose file!
diff --git a/docker-compose.yml b/docker-compose.yml
@@ -0,0 +1,32 @@
+mongo1:
+  hostname: mongo1
+  container_name: localmongo1
+  image: mongo
+  expose:
+    - 27017
+  ports:
+    - 27017:27017
+  restart: always
+  entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+  volumes:
+    - <VOLUME-DIR>:/data/db # This is where your volume will persist. e.g. VOLUME-DIR = ./volumes/mongodb
+  mongo2:
+    hostname: mongo2
+    container_name: localmongo2
+    image: mongo
+    expose:
+      - 27017
+    ports:
+      - 27018:27017
+    restart: always
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
+  mongo3:
+    hostname: mongo3
+    container_name: localmongo3
+    image: mongo
+    expose:
+      - 27017
+    ports:
+      - 27019:27017
+    restart: always
+    entrypoint: [ "/usr/bin/mongod", "--bind_ip_all", "--replSet", "rs0" ]
diff --git a/docker.sh b/docker.sh
@@ -0,0 +1,17 @@
+# run this after setting up the docker-compose This will instantiate the replica set.
+# The id and hostname's can be tailored to your liking, however they MUST match the docker-compose file above.
+docker-compose up -d
+docker exec -it localmongo1 mongo
+
+rs.initiate(
+  {
+    _id : 'rs0',
+    members: [
+      { _id : 0, host : "mongo1:27017" },
+      { _id : 1, host : "mongo2:27017" },
+      { _id : 2, host : "mongo3:27017" }
+    ]
+  }
+)
+
+exit
diff --git a/mongoose.js b/mongoose.js
@@ -0,0 +1,14 @@
+// If on a linux server, use the hostname provided by the docker compose file
+// e.g. HOSTNAME = mongo1, mongo2, mongo3
+
+// If on MacOS add the following to your /etc/hosts file.
+// 127.0.0.1  mongo1
+// 127.0.0.1  mongo2
+// 127.0.0.1  mongo3
+// And use localhost as the HOSTNAME
+mongoose.connect('mongodb://<HOSTNAME>:27017,<HOSTNAME>:27018,<HOSTNAME>:27019/<DBNAME>', {
+  useNewUrlParser : true,
+  useFindAndModify: false, // optional
+  useCreateIndex  : true,
+  replicaSet      : 'rs0', // We use this from the entrypoint in the docker-compose file
+})
diff --git a/transaction.js b/transaction.js
@@ -0,0 +1,26 @@
+async function transaction() {
+  // Start the transaction.
+  const session = await ModelA.startSession();
+  session.startTransaction();
+
+  try {
+    const options = { session };
+
+    // Try and perform operation on Model.
+    const a = await ModelA.create([{ ...args }], options);
+
+    // If the first operation succeeds this next one will get called.
+    await ModelB.create([{ ...args }], options);
+
+    // If all succeeded with no errors, commit and end the session.
+    await session.commitTransaction();
+    session.endSession();
+    return a;
+  } catch (e) {
+    // If any error occured, the whole transaction fails and throws error.
+    // Undos changes that may have happened.
+    await session.abortTransaction();
+    session.endSession();
+    throw e;
+  }
+}
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Thanks to https://gist.github.com/asoorm for helping with his docker-compose file!
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