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安装maven，环境虚拟机：
1.安装yum配置工具
$ yum install -y yum-utils2.使用配置工具配置第三方epel源仓库
[root@ab0be27c0bd3 ~]# yum-config-manager --add-repo http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo
Traceback (most recent call last):
File "/usr/bin/yum-config-manager", line 6, in <module>
import yum
ImportError: No module named yum执行这一步报错
Traceback (most recent call last):
File "/usr/bin/yum-config-manager", line 6, in <module>
import yum
ImportError: No module named yum
根据报错查看文件:
[root@ab0be27c0bd3 ~]# cat /usr/bin/yum-config-manager | head -n 10
#!/usr/bin/python -tt
import os, os.path
import sys
import re
import yum
sys.path.insert(0,'/usr/share/yum-cli')
from utils import YumUtilBase
import logging
import fnmatch说是找不到yum模块，但是yum命令是可以正常使用，百度说是版本不匹配，yum使用python写的
查看python的版本
[root@ab0be27c0bd3 ~]# whereis python
python: /usr/bin/python /usr/bin/python2.7 /usr/bin/python2.7-config /usr/bin/python2.6 /usr/lib/python2.7 /usr/lib64/python2.7 /etc/python /usr/local/bin/python /usr/local/bin/python2.7 /usr/local/bin/python2.7-config /usr/local/lib/python2.7 /usr/include/python2.7 /usr/share/man/man1/python.1.gz
[root@ab0be27c0bd3 ~]#
[root@ab0be27c0bd3 ~]#
[root@ab0be27c0bd3 ~]# python -V
Python 2.7.9可以看到有多个版本，使用中的是2.7.9
看一下 yum使用的版本
[root@ab0be27c0bd3 ~]# cat /usr/bin/yum
#!/usr/bin/python
import sys
try:
import yum
except ImportError:
print >> sys.stderr, """\其实看不出来呀，再看下python的软连接：
[root@ab0be27c0bd3 ~]# ls -il /usr/bin | grep python
33555577 -rwxr-xr-x 1 root root 11216 Dec 1 2015 abrt-action-analyze-python
34184332 lrwxrwxrwx 1 root root 24 Jul 19 2019 python -> /usr/local/bin/python2.7
33827326 lrwxrwxrwx 1 root root 9 Nov 22 2016 python2 -> python2.7
34184333 lrwxrwxrwx 1 root root 7 Nov 22 2016 python2.6 -> python2
33827328 -rwxr-xr-x 1 root root 7136 Nov 20 2015 python2.7
33827329 -rwxr-xr-x 1 root root 1835 Nov 20 2015 python2.7-config
33827327 lrwxrwxrwx 1 root root 16 Nov 22 2016 python2-config -> python2.7-config
33827325 lrwxrwxrwx 1 root root 14 Nov 22 2016 python-config -> python2-config其实有点没看懂这个，在我看来，python,python2,python2.6都是指向的是python2.7呀，那/usr/bin/yum和/usr/bin/yum-config-manager使用的版本应该一样的，但是结果就是报错，根据百度的把/usr/bin/yum-config-manager改成2.6
#!/usr/bin/python2.6 -tt再执行命令，居然就不报那个错了+_+||，但是报下面的错:
Loaded plugins: fastestmirror, langpacks
adding repo from: http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo
grabbing file http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo to /etc/yum.repos.d/epel-apache-maven.repo
Could not fetch/save url http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-apache-maven.repo to file /etc/yum.repos.d/epel-apache-maven.repo: [Errno 14] curl#7 - "Failed connect to repos.fedorapeople.org:80; Connection refused"
因为我是在虚拟机上执行的，无法连接外网，所以需要开通外网(直接用的公司的工具，点下开通外网就行，具体怎么给虚拟机开通外网还没研究) ，开通外网后这步命令执行成功。
3.启用仓库
[root@ab0be27c0bd3 ~]# yum-config-manager --enable epel-apache-maven
Loaded plugins: fastestmirror, langpacks
============================================================================== repo: epel-apache-maven ==============================================================================
[epel-apache-maven]
async = True
bandwidth = 0
base_persistdir = /var/lib/yum/repos/x86_64/7
baseurl = http://repos.fedorapeople.org/repos/dchen/apache-maven/epel-7/x86_64/4.安装maven
[root@ab0be27c0bd3 ~]# yum install -y apache-maven
There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:
No module named yum
Please install a package which provides this module, or
verify that the module is installed correctly.
It's possible that the above module doesn't match the
current version of Python, which is:
2.7.9 (default, Jul 19 2019, 14:45:37)
[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]
If you cannot solve this problem yourself, please go to
the yum faq at:
http://yum.baseurl.org/wiki/Faq？？版本又不匹配？
然后把/usr/bin/yum也改成2.6
#!/usr/bin/python2.6
import sys
try:不说版本不一致了,然鹅
[root@ab0be27c0bd3 ~]# yum install -y apache-maven
▽
Loaded plugins: fastestmirror, langpacks
▽
#! /usr/bin/python-ext-down
base | 3.6 kB 00:00:00
didi_jenkins_enable | 1.5 kB 00:00:00
didi_op_toa_enable | 1.5 kB 00:00:00
didi_txjenkins_enable | 1.5 kB 00:00:00
epel | 5.3 kB 00:00:00
epel-apache-maven | 3.3 kB 00:00:00
extras | 3.4 kB 00:00:00
updates | 3.4 kB 00:00:00
Traceback (most recent call last):
File "/usr/libexec/urlgrabber-ext-down", line 22, in <module>
from urlgrabber.grabber import \
ImportError: No module named urlgrabber.grabber
Exiting on user cancel然后vim /usr/libexec/urlgrabber-ext-down
把头改成
#! /usr/bin/python-ext-down再执行打印了一堆东西，也不知道成功没，使用命令mvn -version，说命令找不到
最后换了种方式:
//下载
# wget http://mirrors.cnnic.cn/apache/maven/maven-3/3.5.4/binaries/apache-maven-3.5.4-bin.tar.gz
//解压
# tar -zxvf apache-maven-3.5.4-bin.tar.gz
//移动
# mv apache-maven-3.5.4 /usr/loca/apache-maven-3.5.4
//配置maven
# vim /etc/profile
export MAVEN_HOME=/usr/loca/apache-maven-3.5.4
export PATH=$MAVEN_HOME/bin:$PATH
//使配置生效
# source /etc/profile黑人问号，所以也没有用的yum就是了，和标题不符。反正就用这个maven
终于搞好了maven，接着就是构建启动项目，构建项目的时候又报错：
The JAVA_HOME environment variable is not defined correctly
This environment variable is needed to run this program
NB: JAVA_HOME should point to a JDK not a JRE
百度解决方法，去到我maven安装目录下修改启动文件:
# vim /usr/local/apache-maven-3.5.4/bin/mvn
//加上
JAVA_HOME=`/usr/local/jdk1.8.0_65`附Java/C/C++/机器学习/算法与数据结构/前端/安卓/Python/程序员必读/书籍书单大全：
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