centos7 安装mongo ./mongod: error while loading shared libraries: libnetsnmpmibs.so.31:
入坑两次：第二次几近崩溃，容我吐槽一下，以表明治。。
问题是这：
NETWORK [thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
./mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory
第一次是2018年2月3号；今天是2018年4月24，时隔近3个月，由于ECS到期要迭代原因，所有东西重装，两次都是tar.gz安装mongo, data目录db与logs/mongodb.log已创建好，mongo.conf如下
# 设置数据文件的存放目录
dbpath = /alex/data/mongo/mongo3.2.15/data/db
# 设置日志文件的存放目录及其日志文件名
logpath = /alex/data/mongo/mongo3.2.15/data/logs/mongodb.log
# 设置端口号（默认的端口号是 27017）
port = 27017
# 设置为以守护进程的方式运行，即在后台运行
fork = true
# nohttpinterface = true
nohttpinterface = true
#登录验证
#noauth=false
问题开始出现~2：
操作步骤：1
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongo
MongoDB shell version: 3.2.15
connecting to: test
2018-04-24T21:53:16.940+0800 W NETWORK[thread1] Failed to connect to 127.0.0.1:27017, in(checking socket for error after poll), reason: errno:111 Connection refused
2018-04-24T21:53:16.940+0800 E QUERY [thread1] Error: couldn't connect to server 127.0.0.1:27017, connection attempt failed :
connect@src/mongo/shell/mongo.js:229:14
@(connect):1:6
exception: connect failed
不服：进行操作步骤2
[root@alex /alex/data/mongo/mongo3.2.15]$ ./bin/mongod --dbpath=/alex/data/mongo/mongo3.2.15/data/db/
./bin/mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory
[root@alex /alex/data/mongo/mongo3.2.15]$ cd bin/
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongod --dbpath=/alex/data/mongo/mongo3.2.15/data/db/
./mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ vim mongo.conf
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongod --dbpath=/alex/data/mongo/mongo3.2.15/data/db/^C
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongod --config mongo.conf
./mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongod --config mongo.conf
./mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ls
bsondump mongo mongo.conf mongod mongodecrypt mongodump mongoexport mongofiles mongoimport mongooplog mongoperf mongorestore mongos mongosniff mongostat mongotop
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ chmod 777 mongod
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongod --config mongo.conf
./mongod: error while loading shared libraries: libnetsnmpmibs.so.31: cannot open shared object file: No such file or directory“libnetsnmpmibs.so.31”不小心翻到2月3号给人家留言的博客，定位到这个时间点，本想查看自己的csdn，发现并没做记录无奈之下去旧的ecs上蹭人品，用history看一下操作记录指令，惊奇的发现前1000行竟然是从mongo开始的。感谢上帝的怜悯
37 cd /space/data/mongo3.2.15/bin/
38 ls
39 ./mongod --config mongo.conf
40 sudo service mongod start
41 cd ../
42 ls
43 cd ../
44 ls
45 cd mongo3.2.15/
46 ls
47 cd bin/
48 ls
49 ./mongod
50 ls
51 ./mongo
52 ./mongod
53 yum whatprovides libstdc++.so.6
54 yum whatprovides libstdc++.so.31
55 yum whatprovides libnetsnmpmibs.so.31
56 yum -y install net-snmp-agent-libs-5.7.2-28.el7_4.1.i686
57 ./mongod --config mongo.conf
58 ./mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log --logappend --fork
59 yum whatprovides libnetsnmpmibs.so.31
60 mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log --logappend --fork
61 sudo ln -s /lib/libcrypto.so.0.9.8 /lib/libnetsnmpmibs.so.31
62 sudo ln -s /lib/libcrypto.so.0.9.8 /lib/libnetsnmpmibs.so.31 -y
63 ln --help
64 ls
65 ./mongod
66 cat mongod
67 ./mongod
68 ls
69 sudo -i
70 cd /space/data/mongo3.2.15/bin/
71 ls
72 ./mongod
73 sudo ln -s ~/Downloads/mongodb-correct-version/bin/mongod /usr/local/sbin/bin/mongod
74 sudo ln -s ~/Downloads/mongodb-correct-version/bin/mongod /space/data/mongo3.2.15/bin/mongod
75 sudo ln -s ~/Downloads/mongodb-correct-version/bin/mongod /space/data/mongo3.2.15/bin/mongod --version
76 ./mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log --logappend --fork
77 cd /etc/
78 ls
79 cd init.d/
80 ls
81 mongod --dbpath ~/data/db/
82 cd /space/data/mongo3.2.15/bin/
83 mongod --dbpath ~/data/db/
84 sudo cp /lib/x86_64-linux-gnu/libssl.so.1.0.0 /usr/lib/libssl.so.31
85 sudo apt-get update
86 sudo apt-get install snmp
87 yum install -y snmp
88 yum -y install snmp
89 cd /space/data/mongo3.2.15/bin/
90 ls
91 ll -lhtr /usr/lib64/libnetsnmp.so.31
92 mv /usr/lib64//usr/lib64/libnetsnmp.so.31 /tmp/
93 mv /usr/lib64/libnetsnmp.so.31 /tmp/
94 ps -ef | grep mongo
95 kill 32317
96 ./mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log --logappend --fork –smallfiles –nojournal
97 mv /tmp/libnetsnmp.so.31 /usr/lib64/
98 ./mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log --logappend --fork –smallfiles –nojournal
99 ./mongod --dbpath=/space/data/mongo3.2.15/data/db --logpath=/space/data/mongo3.2.15/data/logs/mongodb.log –smallfiles –nojournal &
100 ./mongod -dbpath /space/data/mongo3.2.15/data/db -logpath /space/data/mongo3.2.15/data/logs/mongodb.log –smallfiles –nojournal &
101 ./mongod -dbpath /space/data/mongo3.2.15/data/db -logpath /space/data/mongo3.2.15/data/logs/mongodb.log –smallfiles –nojournal
102 ./mongod -dbpath /space/data/mongo3.2.15/data/db -logpath /space/data/mongo3.2.15/data/logs/mongodb.log
103 ./mongo
104 ./mongo --port 40000
105 service mongod start
106 sudo -i
107 sudo -i
108 cd /tmp/
109 ls此处参考博客：https://blog.csdn.net/qq_17202587/article/details/78538065
在启动 mongod的时候遇到error while loading shared libraries: libnetsnmpagent.so.20: cannot open shared object file: No such file or directory
该error 是因为未装net-snmp
直接连接外网的Linux服务器可直接使用：yum install net-snmp
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ yum install net-snmp
base | 3.6 kB 00:00:00
epel | 4.7 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
Loading mirror speeds from cached hostfile
Resolving Dependencies
Installing : 1:net-snmp-libs-5.7.2-28.el7_4.1.x86_64 1/4
Installing : 1:net-snmp-agent-libs-5.7.2-28.el7_4.1.x86_64 2/4
Installing : perl-Data-Dumper-2.145-3.el7.x86_64 3/4
Installing : 1:net-snmp-5.7.2-28.el7_4.1.x86_64 4/4
Verifying : perl-Data-Dumper-2.145-3.el7.x86_64 1/4
Verifying : 1:net-snmp-5.7.2-28.el7_4.1.x86_64 2/4
Verifying : 1:net-snmp-agent-libs-5.7.2-28.el7_4.1.x86_64 3/4
Verifying : 1:net-snmp-libs-5.7.2-28.el7_4.1.x86_64 4/4
Installed:
net-snmp.x86_64 1:5.7.2-28.el7_4.1
Dependency Installed:
net-snmp-agent-libs.x86_64 1:5.7.2-28.el7_4.1 net-snmp-libs.x86_64 1:5.7.2-28.el7_4.1 perl-Data-Dumper.x86_64 0:2.145-3.el7
Complete!
[root@alex /alex/data/mongo/mongo3.2.15/bin]$ ./mongo
MongoDB shell version: 3.2.15
connecting to: test
Server has startup warnings:
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten]
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten]
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/enabled is 'always'.
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten]
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** We suggest setting it to 'never'
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten]
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten] ** WARNING: soft rlimits too low. rlimits set to 7283 processes, 65535 files. Number of processes should be at least 32767.5 : 0.5 times number of files.
2018-04-24T23:36:09.715+0800 I CONTROL [initandlisten]
MongoDB Enterprise > show dbs
local 0.000GB
MongoDB Enterprise > use hellotables
switched to db hellotables
MongoDB Enterprise > db.hellotales.insert({"name":"菜鸟教程"})
WriteResult({ "nInserted" : 1 })
MongoDB Enterprise > show tables
完成，，这次再晚也要记录，可以洗漱睡觉去了~