FAQs and solutions for installing and using openstack in devstack _ MySQL

Devstack installation and use openstack FAQ and solution statement:

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1. When installing the run create-stack-user.sh script, the current directory is not devstack
2. If the pbr version is incorrect during installation
   Run pip install -- upgrade pbr, pip install -- upgrade setuptools
3. A download timeout prompt is prompted during installation. you can use pip install -- upgrade to install the failed package.
4. During installation, the system prompts that mysql has no permission to execute the following commands:
   Service mysqld stop
   Mysqld_safe -- user = mysql -- skip-grant-tables -- skip-networking &
   Mysql-u root mysql
   UPDATE user SET Password = PASSWORD () where USER = 'root ';
   Flush privileges;
   Quit
   Service mysqld stop
   
5. The default size of the devstack volume is relatively small (10 GB) and can be adjusted during installation (this environment variable can be imported under the stack user)
   Export VOLUME_BACKING_FILE_SIZE = 102500 M
   
6. To install openstack, you need to access the pypi website. if timeout fails
   You can run./unstack. sh,./stack. sh to solve the problem.
7. After the system is restarted, you need to run rejoin. sh and restore the volume group before running.
   Losetup-f/opt/stack/data/stack-volumes-backing-file
   
8. The volume size is small after installation. you can adjust the volume size as follows:
   The default lvm backend capacity for devstack installation is 10 GB.
   You can modify the configuration as follows:
   
   1. Qemu-img create-f raw 100G
   2. Losetup-f
   3. Pvcreate
   4. Vgextend
      Note: vg_name can be displayed through vgdisplay.
9. Pip displays "No module named pkg resources" error during installation
   $ Wgethttp: // python-distribute.org/distribute_setup.py
   $ Python distribute_setup.py
   Detailed reference http://stackoverflow.com/questions/7110360/easy-install-and-pip-doesnt-work
   
10. Failed to start the VM. Error "some rules cocould not be created for interface vnet0"
    Cause:
    Libmongod is not restarted after the firewall is disabled.
    Solution:
    Restart libmongod
    
11. The control node restarts after an unexpected power loss, and mysql fails to start, which also causes the neutron-server to fail to start.
    Rm-rf/var/lib/mysql. sock and restart the node
12. Error: failed to create/opt/stack/horizon/openstack_dashboard/local/
    Solution: execute setenforce 0.
    
13. Disable all screens of devstack
    Solution: screen-wipe