A script that launches a mongo cluster quickly

setup-mongo-cluster.sh

#!/bin/bash

set -e

# Script used to automate mongo cluster setup locally
#
# sirchen 2019.11.10

if [ $# -lt 2 ]; then
    echo "$0 <cmd> <bin root absolute dir>"
    echo "You'd better choose a clean dir to execute the script, because there gonna many files generated within current working dir"
    echo "Command execution order:  start, config, addshard, stat"
    exit 1
fi

interval=1000

cmd=$1
BIN=$2
engine="wiredTiger"

if [ x$3 != x"" ]; then
    interval=$3
fi

if [ x$3 = x"rocksdb" ]; then
    engine=$3
fi

echo_with_color() {
    echo -e "\033[34m$1\033[0m"
}

# simple 3 mongod RS without config,mongos
start_debug() {
    printf -v nodes '%s ' node{1..8}
    rm -f 5k*

    dbpath=db-wt
    if [ $engine = "rocksdb" ]; then dbpath="db-rocks"; fi
    rm -rf $dbpath
    
    mkdir -p $dbpath
    cd $dbpath
    mkdir -p $nodes
    cd ..

    # how to set one log component to 5, set others to 1
    echo_with_color "start 8 mongod"
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node1 --port 50001 -vv --logpath 5k1.log &
    #./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node1 --port 50000 --keyFile keyfile --logpath 50000.log
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node2 --port 50002 -vv --logpath 5k2.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node3 --port 50003 -v --logpath 5k3.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node4 --port 50004 --logpath 5k4.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node5 --port 50005 --logpath 5k5.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node6 --port 50006 --logpath 5k6.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node7 --port 50007 --logpath 5k7.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node8 --port 50008 --logpath 5k8.log &

    sleep 5
    echo_with_color "rs.initiate "

    ./mongo --port 50001 --eval "rs.initiate()"

    sleep 5

    echo_with_color "add 2nd node..."
    ./mongo --port 50001 --eval "rs.add(\"localhost:50002\")"

    echo_with_color "add 3th arbiter node ..."
    ./mongo --port 50001 --eval "rs.add(\"localhost:50003\", {arbiterOnly: true})"

    echo_with_color "add 4th node with priority=0 (votes default 1) ..."
    ./mongo --port 50001 --eval "rs.add({host: \"localhost:50004\", priority: 0})"

    echo_with_color "add 5th node with votes=0 (non-voting member must have priority=0)..."
    ./mongo --port 50001 --eval "rs.add({host: \"localhost:50005\", votes: 0, priority: 0})"

    echo_with_color "add 6th node with hidden(priority must be 0) and votes=1..."
    ./mongo --port 50001 --eval "rs.add({host: \"localhost:50006\", hidden: true, priority: 0})"

    # when votes=0, cannot ack write majority
    echo_with_color "add 7th node with hidden and votes=0..."
    ./mongo --port 50001 --eval "rs.add({host: \"localhost:50007\", hidden: true, votes: 0, priority: 0})"

    echo_with_color "add 8th node with Delayed RS member..."
    ./mongo --port 50001 --eval "rs.add({host: \"localhost:50008\", hidden: true, slaveDelay: 10, priority: 0})"

    echo_with_color "rs.status()"
    ./mongo --port 50001 --eval "rs.status()"

    # to prevent from failover
    ./mongo --port 50001 --eval "cfg=rs.conf(); cfg.settings.heartbeatTimeoutSecs=3600; cfg.settings.electionTimeoutMillis=3600000; rs.reconfig(cfg)"

    echo_with_color "enabling secondary read ..."
    ./mongo --port 50002 --eval "rs.slaveOk()"
}

# start a 3 nodes cluster locally
start_simple() {
    printf -v nodes '%s ' node{1..3}
    rm -f 5k*

    dbpath=db-wt
    if [ $engine = "rocksdb" ]; then dbpath="db-rocks"; fi
    rm -rf $dbpath
    
    mkdir -p $dbpath
    cd $dbpath
    mkdir -p $nodes
    cd ..

    # how to set one log component to 5, set others to 1
    echo_with_color "start 3 mongod"
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node1 --port 50001 --logpath 5k1.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node2 --port 50002 --logpath 5k2.log &
    ./mongod --replSet rs1 --storageEngine $engine  --dbpath ./$dbpath/node3 --port 50003 --logpath 5k3.log &

    sleep 5
    echo_with_color "rs.initiate "

    ./mongo --port 50001 << eof 
    rs.initiate({ _id: "rs1", version: 1, members: [
        { _id:0, host: "localhost:50001" },
        { _id:1, host: "localhost:50002" },
        { _id:2, host: "localhost:50003" }
    ], 
    settings: { chainingAllowed: false}
    })
eof
    sleep 5
}

write_data() {
    ./mongo --port 50001 << eof
    use db1
    for (var i=1; i<10000; i++) {
        db.t.insert({id: i, v1: i+1, ar:[i+2,i+3]})
        sleep($interval)
        db.t.remove({id:i}, { writeConcern: { w: "majority"} })
    }
eof
}

config_shard() {
    config="{_id:"configrs",members: [ { _id:0, host:"127.0.0.1:20000" } ]}"
    $BIN/mongo --port 20000 << eof
    config={_id:"configrs",members: [ { _id:0, host:"127.0.0.1:20000" } ]}
    use admin
    rs.initiate(config)
eof
    $BIN/mongo --port 30001 << eof
    config={_id:"shard1",members: [ { _id:0, host:"127.0.0.1:30001" }, { _id:1, host:"127.0.0.1:30002" },{ _id:2, host:"127.0.0.1:30003" } ]}
    use admin
    rs.initiate(config)
eof
    $BIN/mongo --port 40001 << eof
    config={_id:"shard2",members: [ { _id:0, host:"127.0.0.1:40001" }, { _id:1, host:"127.0.0.1:40002" },{ _id:2, host:"127.0.0.1:40003" } ]}
    use admin
    rs.initiate(config)
eof
}

add_shard_to_mongos() {
    $BIN/mongo --port 30000 << eof
    use admin
    db.runCommand({addshard: "shard1/127.0.0.1:30001,127.0.0.1:30002,127.0.0.1:30003"})
    db.runCommand({addshard: "shard2/127.0.0.1:40001,127.0.0.1:40002,127.0.0.1:40003"})
eof
}

shard_stat_from_mongos() {
    $BIN/mongo --port 30000 << eof
    use admin
    db.runCommand({listshards:1})
    sh.status()
eof
}

shard_db() {
    if [ $# -ne 1 ]; then
        echo "no db name"
        exit 1
    fi
    db=$1
    $BIN/mongo --port 30000 << eof
    use admin
    db.runCommand({enablesharding: "$db"})
    db.runCommand({shardcollection: "$db.t", key: {k: 'hashed'}})
eof
}

common_commands() {
    echo_with_color "buildinfo ..."
    $BIN/mongo --port 30000 << eof
    db.runCommand({buildinfo:1})
eof
    echo_with_color "listdatabases ..."
    $BIN/mongo --port 30000 << eof
    use admin
    db.runCommand({listdatabases:1})
eof
    #db.runCommand({serverStatus:1}) # very long
    #db.runCommand({ping:1})
}

# https://www.jianshu.com/p/f41e35e20e2b
# https://codereview.stackexchange.com/questions/172294/bash-script-to-deploy-a-mongodb-cluster-on-local-machine
start_shard() {
    rm -rf shard1/data-* shard2/data-* configrs/data/*
    rm -rf *.log
    mkdir -p shard1/data-30001 shard1/data-30002 shard1/data-30003
    mkdir -p shard2/data-40001 shard2/data-40002 shard2/data-40003
    mkdir -p configrs/data

    echo_with_color "starting shard1 ..."
    $BIN/mongod -f mongo-conf/30001.conf
    $BIN/mongod -f mongo-conf/30002.conf
    $BIN/mongod -f mongo-conf/30003.conf

    echo_with_color "starting shard2 ..."
    $BIN/mongod -f mongo-conf/40001.conf
    $BIN/mongod -f mongo-conf/40002.conf
    $BIN/mongod -f mongo-conf/40003.conf

    echo_with_color "starting config server ..."
    $BIN/mongod -f mongo-conf/config.conf

    echo_with_color "starting mongos server ..."
    $BIN/mongos -f mongo-conf/mongos.conf
}

regular_commands() {
    echo
}

stop() {
    killall $BIN/mongod
    killall $BIN/mongos
}


case $cmd in
    run)
        $0 start $BIN
        $0 config $BIN
        $0 addshard $BIN
        $0 stat $BIN
        ;;
    start)
        start_shard
        ;;
    debug)
        start_debug
        ;;
    simple)
        start_simple
        ;;
    stop)
        stop
        ;;
    rc)
        regular_commands
        ;;
    config)
        config_shard
        ;;
    addshard)
        add_shard_to_mongos
        ;;
    stat)
        shard_stat_from_mongos        
        ;;
    sharddb)
        shard_db db1
        ;;
    common-commands|cc)
        common_commands
        ;;
    write)
        write_data
        ;;
esac

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