安装准备

• NUMA Settings

  Running MongoDB on a system with Non-Uniform Access Memory (NUMA) can cause a number of operational problems, including slow performance for periods of time and high system process usage.

  sysctl -w vm.zone_reclaim_mode=0

• Kernel and File Systems

  When running MongoDB in production on Linux, you should use Linux kernel version 2.6.36 or later,
  with either the XFS or EXT4 filesystem. If possible, use XFS as it generally performs better with MongoDB.

  XFS is the default file system for CentOS7.

• DNS settings

  cat > /etc/resolv.conf << EOF
  nameserver 172.20.224.134
  EOF

• NTP Settings

  Use the Network Time Protocol (NTP) to synchronize time among your hosts. This is especially important in sharded clusters.

  yum -y install chrony
  #sync time from local time server
  sed -i '/^server*/d' /etc/chrony.conf
  sed -i -e '/^# Please consider*/a\server ntp01' /etc/chrony.conf
  systemctl enable chronyd && systemctl restart chronyd

• Turn off Atime

  Turn off atime for the storage volume containing the database files.
  add mount option “noatime,nodiratime” in /etc/fstab

  vim /etc/fstab
  /dev/mapper/VolGroup-lv_data /data     xfs    defaults,noatime,nodiratime     1 1

• ulimt settings

  Set the file descriptor limit, -n, and the user process limit (ulimit), -u, above 20,000, according to the suggestions in the ulimit reference.

  #check ulimit
  ulimit -a
  
  #set ulimit for mongod
  cat >> /etc/security/limits.conf << EOF
   mongod soft nproc 65535
   mongod hard nproc 65535
  EOF

• Disable Transparent Huge Pages

  MongoDB performs better with normal (4096 bytes) virtual memory pages.

  echo never > /sys/kernel/mm/transparent_hugepage/enabled;
  echo never > /sys/kernel/mm/transparent_hugepage/defrag;
  chmod +x /etc/rc.d/rc.local

  

  For CentOS 6 , refer to Disable Transparent Huge Pages

• Disable selinux

  It’s better to set selinux permissive ranther than disabled

  sed -i s/^SELINUX=.*/SELINUX=permissive/g /etc/selinux/config

• Disable iptables

  service iptables stop && chkconfig iptables off
  service ip6tables stop && chkconfig ip6tables off

• sshd tunning

  disable dns search when connecting to this server;
  disable PasswordAuthentication confirm when ssh to other servers.

  sed -i 's/^#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config
  sed -i 's/^#PasswordAuthentication no/PasswordAuthentication yes/g' /etc/ssh/sshd_config

• Set the readahead setting

  Setting a higher readahead benefits sequential I/O operations. However, since MongoDB disk access patterns are generally random, setting a higher readahead provides limited benefit or performance degradation.

  • For the WiredTiger storage engine, a readahead of 0 or 16 provides optimal MongoDB performance.
  • For the MMAPv1 storage enginem, A readahead of 32 (16 kB) often works well.

  #get the readahead settings of block device
  blockdev --report
  #change the readahead settings
  blockdev --setra <value> <device>
  blockdev --setra  256 /dev/xvda

安装mongodb

• 设置安装yum源

  国内使用阿里云镜像源

  cat > /etc/yum.repos.d/mongodb-org-3.4.repo << EOF
  [mongodb-org-3.4]
  name=MongoDB Repository
  #baseurl=https://repo.mongodb.org/yum/redhat/$releasever/mongodb-org/3.4/x86_64/
  baseurl=https://mirrors.aliyun.com/mongodb/yum/redhat/\$releasever/mongodb-org/3.4/x86_64/
  gpgcheck=0
  enabled=1
  gpgkey=https://www.mongodb.org/static/pgp/server-3.4.asc
  EOF

• 安装mongodb

  yum -y install mongodb-org
  systemctl enable mongod
  systemctl start mongod

• 修改默认配置（可选）

  同时注释掉只监听localhost的设置：

  mkdir -pv /data/mongodb/storage
  chown -R mongod /data/mongodb/storage

  vim /etc/mongod.conf

  # Where and how to store data.
  storage:
    dbPath: /data/mongodb/storage  #修改为数据存储目录，并确保mongod用户可读写
    journal:
      enabled: true
   
  
  # network interfaces
  net:
    port: 27017
  #  bindIp: 127.0.0.1  #默认监听本地lo，注释掉interfaces.

  systemctl restart mongod

• 创建数据库

  #登录数据库
  mongo
  
  #创建数据库dashboarddb
  use dashboarddb
  
  #Create db user
  db.createUser(
    {
      user: "dashboarduser",
      pwd: "dbpassword",
      roles: [
      {role: "readWrite", db: "dashboarddb"}
      ]
    })

centos6 安装mongodb请参考

http://wiki.timanetwork.com/p…