MongoDB - Recommended production settings

Production settings: For Mongo DB

1) sysctl -w vm.zone_reclaim_mode=0

##Then start mongod, mongos, configservers using numactl

##numactl --interleave=all <path> <options>

##The <path> is the path to the program you are starting and the <options> are any optional arguments to pass to the program.

2) Verify fsync is available

man fsync

3) Set vm.swappiness to 1 for kernel versions 3.5 or later. Or else 0 for lower kernel versions

sysctl -w vm.swappiness=1

cat /proc/sys/vm/swappiness

4) ulimits

vi /etc/security/limits.d/99-mongodb-nproc.conf

@mongod soft fsize unlimited

@mongod hard fsize unlimited

@mongod soft cpu unlimited

@mongod hard cpu unlimited

@mongod soft memlock unlimited

@mongod hard memlock unlimited

@mongod soft nofile 64000

@mongod hard nofile 64000

@mongod soft nproc 64000

@mongod hard nproc 64000

@mongod soft as unlimited

@mongod hard as unlimited

@mongod soft rss unlimited

@mongod hard rss unlimited

chown mongod:mongod /etc/security/limits.d/99-mongodb-nproc.conf

Reference:

https://docs.mongodb.com/manual/reference/ulimit/#recommended-ulimit-settings

5) Disable Transparent Huge Pages (THP)

Check for Red Hat/CentOS 7

https://docs.mongodb.com/manual/tutorial/transparent-huge-pages/#configure-thp-tuned

Reboot required.

6) After config file is updated to desired directories

Configure SELinux

Important: use .*

Check semanage avialiblity: man semanage

If not, yum provides semanage

yum install policycoreutils-python

https://docs.mongodb.com/manual/tutorial/install-mongodb-enterprise-on-red-hat/#install-enterprise-rhel-configure-selinux

7) Set net.ipv4.tcp_keepalive_time=300 in sysctl.conf

then

sysctl -p

8) Read ahead setting to 0

need study...

##9) AWS EC2 performance considerations

need study...

10) cd /etc/yum.repos.d # vi /etc/yum.repos.d/mongodb-enterprise.repo

[mongodb-enterprise]

name=MongoDB Enterprise Repository

baseurl=https://repo.mongodb.com/yum/redhat/7/mongodb-enterprise/3.6/x86_64/

gpgcheck=1

enabled=1

gpgkey=https://www.mongodb.org/static/pgp/server-3.6.asc

Install with: # yum install -y mongodb-enterprise-3.6.2 mongodb-enterprise-server-3.6.2 mongodb-enterprise-shell-3.6.2 mongodb-enterprise-mongos-3.6.2 mongodb-enterprise-tools-3.6.2

Once installed, edit the repository from

enabled=1 to enabled=0

verify by yum repolist

***

Shard 1:

101.11.16.36 -- Primary

101.11.16.12 -- Replica 1

101.11.16.17 -- Replica 2

Shard 2:

102.11.16.75 -- Primary

102.18.16.10 -- Replica 1

102.18.17.5 -- Replica 2

11) Some more sysctl configurations:

fs.file-max=98000

kernel.pid_max=64000

kernel.threads-max=64000

vm.max_map_count=128000

Reference: https://docs.mongodb.com/manual/administration/production-notes/

***