MongoDB-4.0.18介绍与C7下的二进制安装

## mysql数据结构：
name          age  job     host
oldzhang      28   it 
xiaozhang     28   it
xiaofei       18   student  SZ

## mongo数据结构：
{name:'oldzhang',age:'28',job:'it'},
{name:'xiaozhang',age:'28',job:'it'},
{name:'xiaozhang',age:'28',job:'it',host:'SZ'}

mkdir -p /server/{tools,scripts} && cd /server/tools
wget https://fastdl.mongodb.org/linux/mongodb-linux-x86_64-rhel70-4.0.18.tgz

安装依赖：
[root@db01 ~]# yum install libcurl openssl -y
安装目录：
[root@db01 ~]# mkdir /application/mongo_cluster/ -p

[root@db01 /server/tools]# tar xf mongodb-linux-x86_64-rhel70-4.0.18.tgz -C /application/mongo_cluster/
[root@db01 /server/tools]# cd /application/mongo_cluster/
[root@db01 /application/mongo_cluster]# ln -s mongodb-linux-x86_64-rhel70-4.0.18 mongodb
[root@db01 /application/mongo_cluster]# mkdir /application/mongo_cluster/mongo_27017/{conf,logs,pid} -p
[root@db01 /application/mongo_cluster]# mkdir /data/mongo_cluster/mongo_27017 -p

[root@db01 /application/mongo_cluster]# ll
总用量 0
drwxr-xr-x 5 root root  41 5月  14 15:06 mongo_27017
lrwxrwxrwx 1 root root  34 5月  14 15:05 mongodb -> mongodb-linux-x86_64-rhel70-4.0.18
drwxr-xr-x 3 root root 135 5月  14 15:04 mongodb-linux-x86_64-rhel70-4.0.18

[root@db01 ~]# chown  mongod.mongod -R /application/mongo_cluster/
[root@db01 ~]# chown  mongod.mongod -R /data/mongo_cluster/
已集成至systemd启动脚本中

cat > /application/mongo_cluster/mongo_27017/conf/mongodb.conf << EOF
systemLog:
  destination: file
  logAppend: true
  path: /application/mongo_cluster/mongo_27017/logs/mongodb.log
storage:
  journal:
    enabled: true
  dbPath: /data/mongo_cluster/mongo_27017
  directoryPerDB: true
  wiredTiger:
    engineConfig:
      cacheSizeGB: 1
      directoryForIndexes: true
    collectionConfig:
      blockCompressor: zlib
    indexConfig:
      prefixCompression: true
processManagement:
  fork: true
  pidFilePath: /application/mongo_cluster/mongo_27017/pid/mongod.pid
net:
  port: 27017
  bindIp: 127.0.0.1,10.0.0.51
EOF

#日志相关
systemLog:
 destination: file      #Mongodb 日志输出的目的地，指定一个 file 或者 syslog，如果指定 file，必须指定
 logAppend: true        #当实例重启时，不创建新的日志文件，在老的日志文件末尾继续添加
 path: /application/mongo_cluster/mongo_27017/logs/mongodb.log #日志路径

#存储相关
storage:
 journal:               #回滚日志
 enabled: true
 dbPath: /data/mongo_cluster/mongo_27017 #数据存储目录
 directoryPerDB: true #默认 false，不适用 inmemory engine。每个数据库将被保存在一个单独的目录
 wiredTiger:
 engineConfig:
 cacheSizeGB: 1            #将用于所有数据缓存的最大小
 directoryForIndexes: true #默认 false 索引集合 storage.dbPath 存储在数据单独子目录
 collectionConfig:         #表压缩配置
 blockCompressor: zlib
 indexConfig:              #索引配置
 prefixCompression: true

#进程相关
processManagement: #使用处理系统守护进程的控制处理
 fork: true #后台运行
 pidFilePath: /application/mongo_cluster/mongo_27017/pid/mongod.pid #创建 pid 文件

#网络相关
net:
 port: 27017 #监听端口
 bindIp: 127.0.0.1,10.0.0.51 #绑定 ip

[root@db01 ~]# /application/mongo_cluster/mongodb/bin/mongod -f /application/mongo_cluster/mongo_27017/conf/mongodb.conf
[root@db01 ~]# /application/mongo_cluster/mongodb/bin/mongod -f /application/mongo_cluster/mongo_27017/conf/mongodb.conf --shutdown

cat > /lib/systemd/system/mongodb27017.service <<'EOF'
[Unit]
Description=mongodb
After=network.target remote-fs.target nss-lookup.target

[Service]
User=mongod
Group=mongod
Type=forking
PermissionsStartOnly=true
ExecStartPre=/usr/bin/chown mongod.mongod -R /application/mongo_cluster/
ExecStartPre=/usr/bin/chown mongod.mongod -R /data/mongo_cluster/
Environment="OPTIONS=-f /application/mongo_cluster/mongo_27017/conf/mongodb.conf"
ExecStart=/application/mongo_cluster/mongodb/bin/mongod $OPTIONS
#ExecReload=/bin/kill -s HUP $MAINPID
ExecStop=/application/mongo_cluster/mongodb/bin/mongod $OPTIONS --shutdown
PrivateTmp=true

[Install]
WantedBy=multi-user.target
EOF

systemctl daemon-reload
systemctl start mongodb27017.service
systemctl enable mongodb27017.service

1:配置的WiredTiger缓存大小超过可用内存的80%。
** WARNING: The configured WiredTiger cache size is more than 80% of available RAM.
**          See http://dochub.mongodb.org/core/faq-memory-diagnostics-wt

2:未开启登陆认证
** WARNING: Access control is not enabled for the database.
**          Read and write access to data and configuration is unrestricted.

3.大内存页未关闭
** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
**        We suggest setting it to 'never'

** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
**        We suggest setting it to 'never'

cat > /etc/systemd/system/disable-transparent-huge-pages.service <<'EOF'
[Unit]
Description=Disable Transparent Huge Pages (THP)
DefaultDependencies=no
After=sysinit.target local-fs.target
Before=mongod.service

[Service]
Type=oneshot
ExecStart=/bin/sh -c 'echo never | tee /sys/kernel/mm/transparent_hugepage/enabled > /dev/null'

[Install]
WantedBy=basic.target
EOF
systemctl daemon-reload

[root@db01 ~]# cat /sys/kernel/mm/transparent_hugepage/enabled
[always] madvise never
[root@db01 ~]# systemctl start disable-transparent-huge-pages
[root@db01 ~]# cat /sys/kernel/mm/transparent_hugepage/enabled 
always madvise [never]

systemctl enable disable-transparent-huge-pages

echo "ulimit -u 64000"  >> /etc/bashrc
. /etc/profile

[root@db01 ~]# grep "cacheSizeGB" /application/mongo_cluster/mongo_27017/conf/mongodb.conf 
      cacheSizeGB: 1

security:
 authorization: enabled

[root@db01 ~]# mongo 
MongoDB shell version v4.0.18
connecting to: mongodb://127.0.0.1:27017/?gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("35df303c-3320-498d-ae0c-d2dd601810f4") }
MongoDB server version: 4.0.18
Server has startup warnings: 
2020-05-14T17:33:13.213+0800 I STORAGE  [initandlisten] 
2020-05-14T17:33:13.213+0800 I STORAGE  [initandlisten] ** WARNING: The configured WiredTiger cache size is more than 80% of available RAM.
2020-05-14T17:33:13.213+0800 I STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/faq-memory-diagnostics-wt
2020-05-14T17:33:13.984+0800 I CONTROL  [initandlisten] 
2020-05-14T17:33:13.984+0800 I CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-05-14T17:33:13.984+0800 I CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2020-05-14T17:33:13.984+0800 I CONTROL  [initandlisten] 
---
Enable MongoDB's free cloud-based monitoring service, which will then receive and display
metrics about your deployment (disk utilization, CPU, operation statistics, etc).

The monitoring data will be available on a MongoDB website with a unique URL accessible to you
and anyone you share the URL with. MongoDB may use this information to make product
improvements and to suggest MongoDB products and deployment options to you.

To enable free monitoring, run the following command: db.enableFreeMonitoring()
To permanently disable this reminder, run the following command: db.disableFreeMonitoring()
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