安装Airflow遇到的问题以及解决过程

1.安装pip

1.1pip下载

# wget "https://pypi.python.org/packages/source/p/pip/pip-1.5.4.tar.gz#md5=834b2904f92d46aaa333267fb1c922bb" --no-check-certificate

1.2 pip 安装

# tar -xzvf pip-1.5.4.tar.gz
# cd pip-1.5.4
# python setup.py install

1.3 pip 更新

sudo pip install airflow
```
### 2.安装Airflow
#### 2.1第一次安装airflow
```
sudo pip install airflow
```

#### 2.2报错：
  >File "numpy/core/setup.py", line 408, in generate_config_h
    'depends': lib_depends},
  File "numpy/core/setup.py", line 40, in check_types
    from setuptools import setup, Command
  File "numpy/core/setup.py", line 269, in check_types
    'pandas/index.pyx',
SystemError: Cannot compile 'Python.h'. Perhaps you need to install python-dev|python-devel.

####2.3.安装airflow报错，需要安装python-devel
```
sudo yum install python-devel
```
>[sudo] password for etluser: 
已加载插件：langpacks
Repodata is over 2 weeks old. Install yum-cron? Or run: yum makecache fast
base                                                                                    | 3.6 kB  00:00:00     
epel                                                                                    | 4.3 kB  00:00:00     
extras                                                                                  | 3.4 kB  00:00:00     
updates                                                                                 | 3.4 kB  00:00:00     
(1/4): extras/7/x86_64/primary_db                                                       | 117 kB  00:00:00     
(2/4): epel/x86_64/updateinfo                                                           | 540 kB  00:00:00     
(3/4): epel/x86_64/primary_db                                                           | 4.1 MB  00:00:04     
(4/4): updates/7/x86_64/primary_db                                                      | 4.1 MB  00:00:04     
正在解              
完毕！

####2.4 再次安装Airflow，安装成功
```
sudo pip install airflow
```
>Collecting airflow
Running setup.py install for sqlalchemy ... done
  Running setup.py install for MarkupSafe ... done
  Running setup.py install for Mako ... done
  Successfully installed 
安装成功

### 3.解决MySqlOperator的问题：
#### 3.1 MySqlOperator import报错
```
ImportError: cannot import name MySqlOperator
```

####3.2 因为缺少mysqlclient导致，安装mysqlclient
```
sudo pip install airflow[mysql]
```
>报错：
Collecting mysqlclient>=1.3.6 (from airflow[mysql])
  Downloading mysqlclient-1.3.7.tar.gz (79kB)
    100% |████████████████████████████████| 81kB 24kB/s 
    Complete output from command python setup.py egg_info:
    sh: mysql_config: 未找到命令
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-fvpH52/mysqlclient/setup.py", line 17, in <module>
        metadata, options = get_config()
      File "setup_posix.py", line 44, in get_config
        libs = mysql_config("libs_r")
      File "setup_posix.py", line 26, in mysql_config
        raise EnvironmentError("%s not found" % (mysql_config.path,))
    EnvironmentError: mysql_config not found
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-fvpH52/mysqlclient/

####3.3 安装mysqlclient报错，需要安装python-devel mysql-devel
```
sudo yum install python-devel mysql-devel
```
>已加载插件：langpacks
软件包 python-devel-2.7.5-34.el7.x86_64 已安装并且是最新版本
正在解决依赖关系
--> 正在检查事务
---> 软件包 mariadb-devel.x86_64.1.5.5.47-1.el7_2 将被 安装
--> 解决依赖关系完成


### 3.4 安装Airflow
```
sudo pip install airflow[mysql]
```
>Requirement already satisfied (use --upgrade to upgrade): airflow[mysql] in /usr/lib/python2.7/site-packages
...
Successfully installed mysqlclient-1.3.7