airflow + mysql（CentOS7安装MySQL（完整版））

目录：
1、centos7.8 安装 mysql 5.7
2、mysql-airflow 的配置
3、可能遇到的问题
3.1、初始化 mysql 数据库时 ModuleNotFoundError: No module named 'MySQLdb'

3.2、安装mysql-devel出错

1、centos7.8 安装 mysql 5.7    <-- 返回目录

参考：CentOS7安装MySQL（完整版）

按照教程，修改/etc/my.cnf

在my.cnf 配置 "explicit_defaults_for_timestamp = 1“，后面就不用执行 "set explicit_defaults_for_timestamp = 1;" 了

2、mysql-airflow 的配置   <-- 返回目录

　　在mysql上执行

create database airflow; —— 创建数据库

GRANT all privileges on airflow.* TO 'airflow'@'%' IDENTIFIED BY '123456'; —— 将数据库airflow的所有权限授权airflow用户，密码123456且该用户可在任何IP段登录操作

FLUSH PRIVILEGES; —— 刷新权限

set explicit_defaults_for_timestamp = 1;

on airflow.*：表示airflow数据库的所有表的权限

　　修改airflow配置文件airflow.cfg

executor = LocalExecutor
sql_alchemy_conn = mysql://airflow:123456@mysqlIP/airflow

　　初始化数据库

airflow initdb

若之前使用sqllite初始化过可使用airflow resetdb

　　重启 scheduler 即可(默认并发调度16), 启动webserver:

airflow scheduler
// 启动 webserver
airflow webserver -p 8080
// 重启
airflow webserver -p 8080 -D

　　访问：http://10.86.41.83:8080/

3、可能遇到的问题   <-- 返回目录

3.1、初始化 mysql 数据库时 ModuleNotFoundError: No module named 'MySQLdb'   <-- 返回目录

 　　mysql_config not found

　　解决：

yum install mysql-devel gcc gcc-devel python-devel
pip3 install mysql-python
pip3 install mysqlclient

 　　然后执行 airflow initdb

[root@localairflow airflow]# airflow initdb
DB: mysql://airflow:***@192.168.213.200:3306/airflow
[2020-05-27 11:33:18,143] {db.py:378} INFO - Creating tables
INFO  [alembic.runtime.migration] Context impl MySQLImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
INFO  [alembic.runtime.migration] Running upgrade  -> e3a246e0dc1, current schema
INFO  [alembic.runtime.migration] Running upgrade e3a246e0dc1 -> 1507a7289a2f, create is_encrypted
INFO  [alembic.runtime.migration] Running upgrade 1507a7289a2f -> 13eb55f81627, maintain history for compatibility with earlier migrations
INFO  [alembic.runtime.migration] Running upgrade 13eb55f81627 -> 338e90f54d61, More logging into task_instance
INFO  [alembic.runtime.migration] Running upgrade 338e90f54d61 -> 52d714495f0, job_id indices
INFO  [alembic.runtime.migration] Running upgrade 52d714495f0 -> 502898887f84, Adding extra to Log
INFO  [alembic.runtime.migration] Running upgrade 502898887f84 -> 1b38cef5b76e, add dagrun
INFO  [alembic.runtime.migration] Running upgrade 1b38cef5b76e -> 2e541a1dcfed, task_duration
INFO  [alembic.runtime.migration] Running upgrade 2e541a1dcfed -> 40e67319e3a9, dagrun_config
INFO  [alembic.runtime.migration] Running upgrade 40e67319e3a9 -> 561833c1c74b, add password column to user
INFO  [alembic.runtime.migration] Running upgrade 561833c1c74b -> 4446e08588, dagrun start end
INFO  [alembic.runtime.migration] Running upgrade 4446e08588 -> bbc73705a13e, Add notification_sent column to sla_miss
INFO  [alembic.runtime.migration] Running upgrade bbc73705a13e -> bba5a7cfc896, Add a column to track the encryption state of the 'Extra' field in connection
INFO  [alembic.runtime.migration] Running upgrade bba5a7cfc896 -> 1968acfc09e3, add is_encrypted column to variable table
INFO  [alembic.runtime.migration] Running upgrade 1968acfc09e3 -> 2e82aab8ef20, rename user table
INFO  [alembic.runtime.migration] Running upgrade 2e82aab8ef20 -> 211e584da130, add TI state index
INFO  [alembic.runtime.migration] Running upgrade 211e584da130 -> 64de9cddf6c9, add task fails journal table
INFO  [alembic.runtime.migration] Running upgrade 64de9cddf6c9 -> f2ca10b85618, add dag_stats table
INFO  [alembic.runtime.migration] Running upgrade f2ca10b85618 -> 4addfa1236f1, Add fractional seconds to mysql tables
INFO  [alembic.runtime.migration] Running upgrade 4addfa1236f1 -> 8504051e801b, xcom dag task indices
INFO  [alembic.runtime.migration] Running upgrade 8504051e801b -> 5e7d17757c7a, add pid field to TaskInstance
INFO  [alembic.runtime.migration] Running upgrade 5e7d17757c7a -> 127d2bf2dfa7, Add dag_id/state index on dag_run table
INFO  [alembic.runtime.migration] Running upgrade 127d2bf2dfa7 -> cc1e65623dc7, add max tries column to task instance
INFO  [alembic.runtime.migration] Running upgrade cc1e65623dc7 -> bdaa763e6c56, Make xcom value column a large binary
INFO  [alembic.runtime.migration] Running upgrade bdaa763e6c56 -> 947454bf1dff, add ti job_id index
INFO  [alembic.runtime.migration] Running upgrade 947454bf1dff -> d2ae31099d61, Increase text size for MySQL (not relevant for other DBs' text types)
INFO  [alembic.runtime.migration] Running upgrade d2ae31099d61 -> 0e2a74e0fc9f, Add time zone awareness
INFO  [alembic.runtime.migration] Running upgrade d2ae31099d61 -> 33ae817a1ff4, kubernetes_resource_checkpointing
INFO  [alembic.runtime.migration] Running upgrade 33ae817a1ff4 -> 27c6a30d7c24, kubernetes_resource_checkpointing
INFO  [alembic.runtime.migration] Running upgrade 27c6a30d7c24 -> 86770d1215c0, add kubernetes scheduler uniqueness
INFO  [alembic.runtime.migration] Running upgrade 86770d1215c0, 0e2a74e0fc9f -> 05f30312d566, merge heads
INFO  [alembic.runtime.migration] Running upgrade 05f30312d566 -> f23433877c24, fix mysql not null constraint
INFO  [alembic.runtime.migration] Running upgrade f23433877c24 -> 856955da8476, fix sqlite foreign key
INFO  [alembic.runtime.migration] Running upgrade 856955da8476 -> 9635ae0956e7, index-faskfail
INFO  [alembic.runtime.migration] Running upgrade 9635ae0956e7 -> dd25f486b8ea, add idx_log_dag
INFO  [alembic.runtime.migration] Running upgrade dd25f486b8ea -> bf00311e1990, add index to taskinstance
INFO  [alembic.runtime.migration] Running upgrade 9635ae0956e7 -> 0a2a5b66e19d, add task_reschedule table
INFO  [alembic.runtime.migration] Running upgrade 0a2a5b66e19d, bf00311e1990 -> 03bc53e68815, merge_heads_2
INFO  [alembic.runtime.migration] Running upgrade 03bc53e68815 -> 41f5f12752f8, add superuser field
INFO  [alembic.runtime.migration] Running upgrade 41f5f12752f8 -> c8ffec048a3b, add fields to dag
INFO  [alembic.runtime.migration] Running upgrade c8ffec048a3b -> dd4ecb8fbee3, Add schedule interval to dag
INFO  [alembic.runtime.migration] Running upgrade dd4ecb8fbee3 -> 939bb1e647c8, task reschedule fk on cascade delete
INFO  [alembic.runtime.migration] Running upgrade 939bb1e647c8 -> 6e96a59344a4, Make TaskInstance.pool not nullable
INFO  [alembic.runtime.migration] Running upgrade 6e96a59344a4 -> d38e04c12aa2, add serialized_dag table
Revision ID: d38e04c12aa2
Revises: 6e96a59344a4
Create Date: 2019-08-01 14:39:35.616417
INFO  [alembic.runtime.migration] Running upgrade d38e04c12aa2 -> b3b105409875, add root_dag_id to DAG
Revision ID: b3b105409875
Revises: d38e04c12aa2
Create Date: 2019-09-28 23:20:01.744775
INFO  [alembic.runtime.migration] Running upgrade 6e96a59344a4 -> 74effc47d867, change datetime to datetime2(6) on MSSQL tables
INFO  [alembic.runtime.migration] Running upgrade 939bb1e647c8 -> 004c1210f153, increase queue name size limit
INFO  [alembic.runtime.migration] Running upgrade c8ffec048a3b -> a56c9515abdc, Remove dag_stat table
INFO  [alembic.runtime.migration] Running upgrade a56c9515abdc, 004c1210f153, 74effc47d867, b3b105409875 -> 08364691d074, Merge the four heads back together
INFO  [alembic.runtime.migration] Running upgrade 08364691d074 -> fe461863935f, increase_length_for_connection_password
INFO  [alembic.runtime.migration] Running upgrade fe461863935f -> 7939bcff74ba, Add DagTags table
INFO  [alembic.runtime.migration] Running upgrade 7939bcff74ba -> a4c2fd67d16b, add pool_slots field to task_instance
INFO  [alembic.runtime.migration] Running upgrade a4c2fd67d16b -> 852ae6c715af, Add RenderedTaskInstanceFields table
INFO  [alembic.runtime.migration] Running upgrade 852ae6c715af -> 952da73b5eff, add dag_code table
WARNI [airflow.utils.log.logging_mixin.LoggingMixin] cryptography not found - values will not be stored encrypted.
Done.

　　查看 MySQL

3.2、安装mysql-devel出错   <-- 返回目录

　　如果mysql安装参考的是：CentOS7安装MySQL（完整版）。则执行yum install mysql-devel 没有问题。

　　如果mysql安装参考的是：CentOS7下Mysql5.5的rpm安装及配置。则执行yum install mysql-devel 时

 　　原因：CentOS7下Mysql5.5的rpm安装及配置安装之后 /etc/yum.repos.d/ 目录下并没有MySQL的源, 导致在安装mysql-devel出错。

安装mysql5.7的源解决：

[root@localhost ~]# cd /etc/yum.repos.d/
[root@localhost ~]# rpm -ivh http://repo.mysql.com/mysql55-community-release-el7-8.noarch.rpm
[root@localhost ~]# yum install mysql-devel

 　　vim mysql-community.repo

 　　此时执行yum install mysql-devel

 　　发生冲突：

参考：

　　1） CentOS7安装Airflow

　　2）Airflow安装与简单使用

　　3）airflow 安装，部署，填坑