mongodb 3.2.5 Installation details

1. Prepare installation media

Installation media Download:

mongodb installation, I usually use base 2 package, the inner network can not be configured to connect to the external network yum source;

The official recommended download address for mongodb is: ES10en.mongodb.org

But in fact, this address, it is difficult to find the download table, normal download, usually can use the following download address select download:

https://www.mongodb.org/dl/linux/x86_64

I here to download: corresponding mongodb 3.2.5 version - linux - x86_64 - rhel62-3.2.5-20 - g07e21d8. tgz

If the entire mongodb installation process has been scripted, the installation script can be obtained and used to execute the installation;

If installed manually, you can skip this step;

Manually install the steps of mongodb as follows:

mkdir -p /root/{software,scripts}
wget -q http://ptmaster.test.cn/files/init/mongodb_install.sh -O /root/scripts/mongodb_install.sh
cd /root/scripts
./mongodb_install.sh -p 27117

2. Add mongodb user and environment variables and modify system Settings

Add user:

groupadd mongodb 
useradd -g mongodb mongodb

Create the mongodb script directory

mkdir -p /home/mongodb/scripts/

Modify directory permissions:

chown -R mongodb:mongodb /home/mongodb/scripts/

Add the mongodb user's environment variable in /etc/profile:

# MongoDB Environment Variables
export PATH=$PATH:$HOME/bin:/usr/local/mongodb/bin:/home/mongodb/scripts/

Is the above variable in effect:

source /etc/profile

The actual operation process is as follows:

[root@yq-mapp-otadb248 etc]# id mongodb 
id: mongodb: No such user 
[root@yq-mapp-otadb248 etc]# 
[root@yq-mapp-otadb248 etc]# 
[root@yq-mapp-otadb248 etc]# groupadd mongodb 
useradd -g mongodb mongodb[root@yq-mapp-otadb248 etc]# useradd -g mongodb mongodb 
[root@yq-mapp-otadb248 etc]# 
[root@yq-mapp-otadb248 etc]# 
[root@yq-mapp-otadb248 etc]# id mongodb 
uid=801(mongodb) gid=801(mongodb) groups=801(mongodb) 
[root@yq-mapp-otadb248 etc]#

mongodb requires hugepage to be disabled and soft limit to be large enough to start at 1 or go to the end;

cat /etc/security/limits.d/90-nproc.conf

Modify the following values in this file

* soft nproc 2048

Ensure that the value of soft nproc is at least half of the value of soft nofile;

After modification, exit the current user, re-enter 1, the Settings can be effective;

Disable the value of hugepage:

# echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
# echo "never" > /sys/kernel/mm/transparent_hugepage/defrag

Note: The above two warnings will not be modified or affect the installation process. They will be prompted later.

3. Install mongodb

Upload and decompress software:

cd /usr/local
rz mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8.tgz
tar -zxvf mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8.tgz
ln -sv mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 /usr/local/mongodb

Modify file permissions:

groupadd mongodb 
useradd -g mongodb mongodb

0

The actual operation process is as follows:

[root@yq-mapp-otadb248 src]# rz 
rz waiting to receive. 
Starting zmodem transfer. Press Ctrl+C to cancel. 
Transferring mongodb-linux-x86_64-rhel62-3.2.5.tar.gz... 
100% 66999 KB 16749 KB/sec 00:00:04 0 Errors 

[root@yq-mapp-otadb248 src]# ll 
total 277792 
-rw-r--r-- 1 root root 68607629 Oct 19 11:53 mongodb-linux-x86_64-rhel62-3.2.5.tar.gz 
-rw-r--r-- 1 root root 215848960 Apr 19 2016 mongodb-linux-x86_64-rhel62-v3.2-latest 
[root@yq-mapp-otadb248 src]# 
[root@yq-mapp-otadb248 src]# tar -zxvf mongodb-linux-x86_64-rhel62-3.2.5.tar.gz 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/ 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongooplog 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongod 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongo 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongofiles 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/bsondump 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongorestore 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongos 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongoexport 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongodump 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongoimport 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongotop 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongostat 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/bin/mongoperf 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/GNU-AGPL-3.0 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/MPL-2 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/README 
mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8/THIRD-PARTY-NOTICES 
[root@yq-mapp-otadb248 src]# 
[root@yq-mapp-otadb248 src]# ll 
total 277796 
drwxr-xr-x 3 root root 4096 Oct 19 11:54 mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 
-rw-r--r-- 1 root root 68607629 Oct 19 11:53 mongodb-linux-x86_64-rhel62-3.2.5.tar.gz 
-rw-r--r-- 1 root root 215848960 Apr 19 2016 mongodb-linux-x86_64-rhel62-v3.2-latest 
[root@yq-mapp-otadb248 src]# 
[root@yq-mapp-otadb248 src]# mv mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 ../ 
[root@yq-mapp-otadb248 src]# cd .. 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# ln -sv mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 /usr/local/mongodb 
`/usr/local/mongodb' -> `mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8' 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# chown -R mongodb:mongodb mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 
[root@yq-mapp-otadb248 local]# chown -R mongodb:mongodb /usr/local/mongodb 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# ll 
total 52 
drwxr-xr-x. 2 root root 4096 Apr 24 2014 bin 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 etc 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 games 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 include 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 lib 
drwxr-xr-x. 3 root root 4096 Apr 25 2014 lib64 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 libexec 
lrwxrwxrwx 1 root root 25 Mar 6 2015 logstash -> /usr/local/logstash-1.4.2 
drwxrwxr-x 8 logstash logstash 4096 Jun 24 2014 logstash-1.4.2 
lrwxrwxrwx 1 mongodb mongodb 45 Oct 19 11:59 mongodb -> mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 
drwxr-xr-x 3 mongodb mongodb 4096 Oct 19 11:54 mongodb-linux-x86_64-rhel62-3.2.5-20-g07e21d8 
lrwxrwxrwx 1 root root 39 Apr 23 2014 mysql -> /usr/local/mysql-5.5.19-linux2.6-x86_64 
drwxr-xr-x 12 root mysql 4096 Apr 23 2014 mysql-5.5.19-linux2.6-x86_64 
drwxr-xr-x. 2 root root 4096 Sep 23 2011 sbin 
drwxr-xr-x. 6 root root 4096 Apr 25 2014 share 
drwxr-xr-x. 2 root root 4096 Oct 19 11:54 src 
[root@yq-mapp-otadb248 local]#

4. The directories and configuration files required to create an instance of mongodb

Directories required to create mongodb instances:

mkdir -p /data/mongo_27117/{db,log,tmp}

Directories and files required to create the mongodb instance profile:

groupadd mongodb 
useradd -g mongodb mongodb

3

The startup parameters of mongodb are configured as required. My startup parameters are configured as follows:

vim /etc/mongodb/mongo_27117.conf

groupadd mongodb 
useradd -g mongodb mongodb

4

Modify the permissions and groups of directories, files:

groupadd mongodb 
useradd -g mongodb mongodb

5

Verify that the directory and configuration file are ready:

groupadd mongodb 
useradd -g mongodb mongodb

6

The actual operation procedure of this step is as follows:

[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# mkdir -p /data/mongo_27117/{db,log,tmp} 
[root@yq-mapp-otadb248 local]# mkdir -p /etc/mongodb 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# vim /etc/mongodb/mongo_27117.conf 
dbpath=/data/mongo_27117/db 
logpath=/data/mongo_27117/log/mongo_27117.log 
pidfilepath = /data/mongo_27117/tmp/mongo_27117.pid 
storageEngine = wiredTiger 
wiredTigerCacheSizeGB = 2 
syncdelay = 30 
wiredTigerCollectionBlockCompressor = zlib 
port=27117 
auth = true 
directoryperdb = true 
oplogSize=2048 
logappend=true 
fork=true 
#rest=true 
journal = true 
journalCommitInterval = 50 
slowms = 200 
~ 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# chown -R mongodb:mongodb /data/mongo_27117/ 
[root@yq-mapp-otadb248 local]# chown -R mongodb:mongodb /etc/mongodb 
[root@yq-mapp-otadb248 local]# ls -l /data/mongo_27117/ 
total 12 
drwxr-xr-x 2 mongodb mongodb 4096 Oct 19 12:02 db 
drwxr-xr-x 2 mongodb mongodb 4096 Oct 19 12:02 log 
drwxr-xr-x 2 mongodb mongodb 4096 Oct 19 12:02 tmp 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# ls -l /etc/mongodb 
total 4 
-rw-r--r-- 1 mongodb mongodb 392 Oct 19 12:05 mongo_27117.conf 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# cat /etc/mongodb/mongo_27117.conf 
dbpath=/data/mongo_27117/db 
logpath=/data/mongo_27117/log/mongo_27117.log 
pidfilepath = /data/mongo_27117/tmp/mongo_27117.pid 
storageEngine = wiredTiger 
wiredTigerCacheSizeGB = 2 
syncdelay = 30 
wiredTigerCollectionBlockCompressor = zlib 
port=27117 
auth = true 
directoryperdb = true 
oplogSize=2048 
logappend=true 
fork=true 
#rest=true 
journal = true 
journalCommitInterval = 50 
slowms = 200

5. Start the mongodb instance and change the administrator password

Start the mongodb service using the following command:

/usr/local/mongodb/bin/mongod --config /etc/mongodb/mongo_27117.conf

Confirm password, mongodb administrator password, can be set according to the respective rules:

groupadd mongodb 
useradd -g mongodb mongodb

9

To change the administrator password, note that mongodb 3.2 grants three roles to admin, which is different from the previous version:

/usr/local/mongodb/bin/mongo --port=27117
db.createUser({user:'useradmin',pwd:'mongodb_020248_Pass',roles:[ { "role" : "clusterAdmin", "db" : "admin" }, { "role" : "userAdminAnyDatabase", "db" : "admin" }, { "role" : "dbAdminAnyDatabase", "db" : "admin" } ] })
db.auth("useradmin","mongodb_020248_Pass")
db.system.users.find();

After the password is generated, login mongo using the new user and password to confirm the status:

/usr/local/mongodb/bin/mongo --port=27117 -u useradmin -p mongodb_020248_Pass --authenticationDatabase admin

The operation procedure of this step is as follows;

[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# ps -ef|grep mongo 
root 32295 30115 0 12:12 pts/0 00:00:00 grep mongo 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# /usr/local/mongodb/bin/mongod --config /etc/mongodb/mongo_27117.conf 
about to fork child process, waiting until server is ready for connections. 
forked process: 32321 
child process started successfully, parent exiting 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# ps -ef|grep mongo 
root 32321 1 1 12:12 ? 00:00:00 /usr/local/mongodb/bin/mongod --config /etc/mongodb/mongo_27117.conf 
root 32359 30115 0 12:13 pts/0 00:00:00 grep mongo 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# /usr/local/mongodb/bin/mongo --port=27117 
MongoDB shell version: 3.2.5-20-g07e21d8 
connecting to: 127.0.0.1:27117/test 
Welcome to the MongoDB shell. 
For interactive help, type "help". 
For more comprehensive documentation, see 
http://docs.mongodb.org/ 
Questions? Try the support group 
http://groups.google.com/group/mongodb-user 
> 
> use admin; 
switched to db admin 
> db.system.users.find(); 
Error: error: { 
"ok" : 0, 
"errmsg" : "not authorized on admin to execute command { find: \"system.users\", filter: {} }", 
"code" : 13 
} 
> 
> db.createUser({user:'useradmin',pwd:'mongodb_020248_@JJMatch',roles:[ { "role" : "clusterAdmin", "db" : "admin" }, { "role" : "userAdminAnyDatabase", "db" : "admin" }, { "role" : "dbAdminAnyDatabase", "db" : "admin" } ] }) 
Successfully added user: { 
"user" : "useradmin", 
"roles" : [ 
{ 
"role" : "clusterAdmin", 
"db" : "admin" 
}, 
{ 
"role" : "userAdminAnyDatabase", 
"db" : "admin" 
}, 
{ 
"role" : "dbAdminAnyDatabase", 
"db" : "admin" 
} 
] 
} 
> 
> db.system.users.find(); 
Error: error: { 
"ok" : 0, 
"errmsg" : "not authorized on admin to execute command { find: \"system.users\", filter: {} }", 
"code" : 13 
} 
> 
> db.auth("useradmin","mongodb_020248_@JJMatch") 
1 
> 
> db.system.users.find(); 
{ "_id" : "admin.useradmin", "user" : "useradmin", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "6hLx/d97hS+yfoN47QTmXQ==", "storedKey" : "B0PqwVs3GFKIHQyyQ6mBp1MA370=", "serverKey" : "xK53AKKAvFCdn5rsEtij5QB9RtU=" } }, "roles" : [ { "role" : "clusterAdmin", "db" : "admin" }, { "role" : "userAdminAnyDatabase", "db" : "admin" }, { "role" : "dbAdminAnyDatabase", "db" : "admin" } ] } 
> 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# /usr/local/mongodb/bin/mongo --port=27117 -u useradmin -p mongodb_020248_@JJMatch --authenticationDatabase admin 
MongoDB shell version: 3.2.5-20-g07e21d8 
connecting to: 127.0.0.1:27117/test 
Server has startup warnings: 
2016-10-19T12:12:59.096+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.096+0800 I CONTROL [initandlisten] ** WARNING: The server was started without specifying a --bind_ip 
2016-10-19T12:12:59.096+0800 I CONTROL [initandlisten] ** and listens for connections on all available network interfaces. 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended. 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'. 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never' 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'. 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never' 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 2048 processes, 8192 files. Number of processes should be at least 4096 : 0.5 times number of files. 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
> 
> use admin; 
switched to db admin 
> 
> db.system.users.find(); 
{ "_id" : "admin.useradmin", "user" : "useradmin", "db" : "admin", "credentials" : { "SCRAM-SHA-1" : { "iterationCount" : 10000, "salt" : "6hLx/d97hS+yfoN47QTmXQ==", "storedKey" : "B0PqwVs3GFKIHQyyQ6mBp1MA370=", "serverKey" : "xK53AKKAvFCdn5rsEtij5QB9RtU=" } }, "roles" : [ { "role" : "clusterAdmin", "db" : "admin" }, { "role" : "userAdminAnyDatabase", "db" : "admin" }, { "role" : "dbAdminAnyDatabase", "db" : "admin" } ] 
> 
>

6. Create a business account for the application

Create 1 admin/admin user, with permission to create users and database by yourself, and then modify the password service by yourself:

db.createUser({user:'admin',pwd:'admin',roles:[{role:'userAdminAnyDatabase',db:'admin'},{role:'dbAdminAnyDatabase',db:'admin'}]})

Verify business account login:

/usr/local/mongodb/bin/mongo --port=27117 -u admin -p admin --authenticationDatabase admin

The actual operation process of this step is as follows:

> 
> db.system.users.find().pretty() 
{ 
"_id" : "admin.useradmin", 
"user" : "useradmin", 
"db" : "admin", 
"credentials" : { 
"SCRAM-SHA-1" : { 
"iterationCount" : 10000, 
"salt" : "6hLx/d97hS+yfoN47QTmXQ==", 
"storedKey" : "B0PqwVs3GFKIHQyyQ6mBp1MA370=", 
"serverKey" : "xK53AKKAvFCdn5rsEtij5QB9RtU=" 
} 
}, 
"roles" : [ 
{ 
"role" : "clusterAdmin", 
"db" : "admin" 
}, 
{ 
"role" : "userAdminAnyDatabase", 
"db" : "admin" 
}, 
{ 
"role" : "dbAdminAnyDatabase", 
"db" : "admin" 
} 
] 
} 
{ 
"_id" : "admin.admin", 
"user" : "admin", 
"db" : "admin", 
"credentials" : { 
"SCRAM-SHA-1" : { 
"iterationCount" : 10000, 
"salt" : "snlJe16a2PX3dSwxnOsfAw==", 
"storedKey" : "VOoX1e7F0tOme6YuR+iyMLuEWK8=", 
"serverKey" : "aSlpI7TzlyJ5Ccbd8GoptNB8khk=" 
} 
}, 
"roles" : [ 
{ 
"role" : "userAdminAnyDatabase", 
"db" : "admin" 
}, 
{ 
"role" : "dbAdminAnyDatabase", 
"db" : "admin" 
} 
] 
} 
> 
> ^C 
bye 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# 
[root@yq-mapp-otadb248 local]# /usr/local/mongodb/bin/mongo --port=27117 -u admin -p admin --authenticationDatabase admin 
MongoDB shell version: 3.2.5-20-g07e21d8 
connecting to: 127.0.0.1:27117/test 
> 
> show dbs 
admin 0.000GB 
local 0.000GB 
> 
>

7. Alarm handling when the instance is started

During the startup of mongodb, 1 warning is sometimes prompted. Two common types of warning processing are as follows:

Warning: 1

Tip:

2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 2048 processes, 8192 files. Number of processes should be at least 4096 : 0.5 times number of files.

According to the prompts, change the processes value from the current 2048 to 4096 or even higher.

ps -ef|grep mongod
cat /proc/32321/limits
cat /etc/security/limits.d/90-nproc.conf 
vim /etc/security/limits.d/90-nproc.conf

The actual operation procedure of this step is as follows:

[root@yq-mapp-otadb248 limits.d]# 
[root@yq-mapp-otadb248 limits.d]# cat /etc/security/limits.d/90-nproc.conf 
# 20160621 limit?? 
#* soft nproc 51200 
#* hard nproc 51200 
* soft nproc 2048 
* hard nproc 16384 
* soft nofile 8192 
* hard nofile 8192 
* soft stack 8192 
* hard stack 8192 
* soft memlock unlimited 
* hard memlock unlimited 
[root@yq-mapp-otadb248 limits.d]# vim /etc/security/limits.d/90-nproc.conf 
# 20160621 
#* soft nproc 51200 
#* hard nproc 51200 
* soft nproc 8192 
* hard nproc 16384 
[root@yq-mapp-otadb248 ~]# 
[root@yq-mapp-otadb248 ~]# ulimt -a 
-bash: ulimt: command not found 
[root@yq-mapp-otadb248 ~]# ulimit -a 
core file size (blocks, -c) 0 
data seg size (kbytes, -d) unlimited 
scheduling priority (-e) 0 
file size (blocks, -f) unlimited 
pending signals (-i) 30422 
max locked memory (kbytes, -l) unlimited 
max memory size (kbytes, -m) unlimited 
open files (-n) 8192 
pipe size (512 bytes, -p) 8 
POSIX message queues (bytes, -q) 819200 
real-time priority (-r) 0 
stack size (kbytes, -s) 8192 
cpu time (seconds, -t) unlimited 
max user processes (-u) 8192 
virtual memory (kbytes, -v) unlimited 
file locks (-x) unlimited

Warning 2:

2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] 
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2016-10-19T12:12:59.097+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'

Confirmation:

cat /sys/kernel/mm/transparent_hugepage/enabled
cat /sys/kernel/mm/transparent_hugepage/defrag

Processing:

echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
echo "never" > /sys/kernel/mm/transparent_hugepage/defrag

The actual operation process of this step is as follows:

[root@yq-mapp-otadb248 limits.d]# cat /sys/kernel/mm/transparent_hugepage/enabled 
[always] madvise never 
[root@yq-mapp-otadb248 limits.d]# cat /sys/kernel/mm/transparent_hugepage/defrag 
[always] madvise never 
[root@yq-mapp-otadb248 limits.d]# 
[root@yq-mapp-otadb248 limits.d]# echo "never" > /sys/kernel/mm/transparent_hugepage/enabled 
[root@yq-mapp-otadb248 limits.d]# echo "never" > /sys/kernel/mm/transparent_hugepage/defrag 
[root@yq-mapp-otadb248 limits.d]# 
[root@yq-mapp-otadb248 limits.d]# cat /sys/kernel/mm/transparent_hugepage/enabled 
always madvise [never] 
[root@yq-mapp-otadb248 limits.d]# cat /sys/kernel/mm/transparent_hugepage/defrag 
always madvise [never] 
[root@yq-mapp-otadb248 limits.d]# 
[root@yq-mapp-otadb248 limits.d]#

8. Create the mongodb instance service management script

For the convenience of the start and stop of mongodb instance, can create mongodb startup scripts, first stop scripts, and then in the/etc/init d scripts/directory to create a service, so that you can use service for instance management.

Script 1: Startup script:

vim /home/mongodb/scripts/mongodb_start.sh

#!/bin/sh 
# the scripts is used to start mongodb instance with port 27117. 
# created by zhaofx on 20161019. 
echo -n "Starting MongoDB port 27117 ... " 
/usr/local/mongodb/bin/mongod --config /etc/mongodb/mongo_27117.conf &

Script 2: Stop script:

vim /home/mongodb/scripts/mongodb_stop.sh

#!/bin/bash 
# the scripts is used to stop mongodb instance with port 27117. 
# created by zhaofx on 20161019. 
echo -n "Stopping MongoDB port 27117" 
pid=`ps -o pid,command ax | grep mongod | awk '!/awk/ && !/grep/ {print $1}'`; 
if [ "${pid}" != "" ]; then 
kill -2 ${pid}; 
fi

Script 3: Service script:

vim /etc/init.d/mongodb

vim /etc/init.d/mongodb 
#! /bin/sh 
# the scripts is used to mange mongodb service with linux service type. 
# created by zhaofx on 20161019. 
PATH=/usr/local/mongodb/bin:/sbin:/bin:/usr/sbin:/usr/bin 
NAME=mongodb 
start(){ 
/home/mongodb/scripts/mongodb_start.sh 
} 
stop(){ 
/home/mongodb/scripts/mongodb_stop.sh 
} 
test -x $DAEMON || exit 0 
set -e 
case "$1" in 
start) 
start 
;; 
stop) 
stop 
;; 
*) 
N=/etc/init.d/$NAME 
echo "Usage: $N {start|stop}" >&2 
exit 1 
;; 
esac 
exit 0

Modify the group of the script to add execution permission:

chown -R mongodb:mongodb /home/mongodb/scripts/ 
chown mongodb:mongodb /etc/init.d/mongodb 
chmod +x /home/mongodb/scripts/mongodb_start.sh 
chmod +x /home/mongodb/scripts/mongodb_stop.sh 
chmod +x /etc/init.d/mongodb

The final procedure for starting and stopping the mongodb instance is:

[root@yq-mapp-otadb248 ~]# 
[root@yq-mapp-otadb248 ~]# service mongodb stop 
Stopping MongoDB port 27117 
[root@yq-mapp-otadb248 ~]# 
[root@yq-mapp-otadb248 ~]# 
[root@yq-mapp-otadb248 ~]# 
[root@yq-mapp-otadb248 ~]# service mongodb start 
Starting MongoDB port 27117 ... [root@yq-mapp-otadb248 ~] 
about to fork child process, waiting until server is ready for connections. 
forked process: 36088 
child process started successfully, parent exiting 
[root@yq-mapp-otadb248 ~]#