技术之路

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迁移的目的

将glance服务迁移到其他节点上，减轻控制节点压力，提高性能。

1)数据库迁移

本次glance迁移到compute2节点上

安装数据库

yum -y install mariadb mariadb-server python2-PyMySQL

修改数据库配置文件

[root@compute2 ~]# vim /etc/my.cnf.d/openstack.cnf

[mysqld]

bind-address = 10.0.0.32

default-storage-engine = innodb

innodb_file_per_table

max_connections = 4096

collation-server = utf8_general_ci

character-set-server = utf8

启动数据库，并设置开机自启动

systemctl enable mariadb.service

systemctl start mariadb.service

【重要】为了保证数据库服务的安全性，运行``mysql_secure_installation``脚本

mysql_secure_installation

2) 镜像glance 数据库迁移

在控制节点的数据库将glance库导出，文件传到计算节点

[root@controller ~]# mysqldump -B glance > glance.sql

[root@controller ~]# rsync -avz glance.sql 10.0.0.32:/opt/

以下操作在compute2节点上进行操作

导入数据库：

[root@compute2 ~]# mysql

MariaDB [(none)]> source /opt/glance.sql

    重新创建glance授权用户

GRANT ALL PRIVILEGES ON glance.* TO 'glance'@'localhost' IDENTIFIED BY 'GLANCE_DBPASS';

GRANT ALL PRIVILEGES ON glance.* TO 'glance'@'%' IDENTIFIED BY 'GLANCE_DBPASS';

3) 安装glance服务

参考文档https://docs.openstack.org/mitaka/zh_CN/install-guide-rdo/glance.html

安装glance相关软件包

yum -y install openstack-glance

#编辑配置文件 /etc/glance/glance-api.conf

yum install openstack-utils -y

cp /etc/glance/glance-api.conf{,.bak}

grep '^[a-Z\[]' /etc/glance/glance-api.conf.bak >/etc/glance/glance-api.conf

openstack-config --set /etc/glance/glance-api.conf database connection mysql+pymysql://glance:GLANCE_DBPASS@10.0.0.32/glance

openstack-config --set /etc/glance/glance-api.conf glance_store stores file,http

openstack-config --set /etc/glance/glance-api.conf glance_store default_store file

openstack-config --set /etc/glance/glance-api.conf glance_store filesystem_store_datadir /var/lib/glance/images/

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken auth_uri http://controller:5000

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken auth_url http://controller:35357

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken memcached_servers controller:11211

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken auth_type password

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken project_domain_name default

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken user_domain_name default

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken project_name service

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken username glance

openstack-config --set /etc/glance/glance-api.conf keystone_authtoken password GLANCE_PASS

openstack-config --set /etc/glance/glance-api.conf paste_deploy flavor keystone

#编辑配置文件 /etc/glance/glance-registry.conf

cp /etc/glance/glance-registry.conf{,.bak}

grep '^[a-Z\[]' /etc/glance/glance-registry.conf.bak > /etc/glance/glance-registry.conf

openstack-config --set /etc/glance/glance-registry.conf database connection mysql+pymysql://glance:GLANCE_DBPASS@10.0.0.32/glance

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken auth_uri http://controller:5000

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken auth_url http://controller:35357

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken memcached_servers controller:11211

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken auth_type password

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken project_domain_name default

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken user_domain_name default

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken project_name service

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken username glance

openstack-config --set /etc/glance/glance-registry.conf keystone_authtoken password GLANCE_PASS

openstack-config --set /etc/glance/glance-registry.conf paste_deploy flavor keystone

4) 迁移原有镜像文件

将原glance上的镜像文件，传输到compute2。

[root@controller ~]# cd /var/lib/glance/images/

[root@controller ~]# rsync -avz `pwd`/ 10.0.0.32:`pwd`/

【注意权限】传输过后，在compute2上查看权限

[root@compute2 ~]# cd /var/lib/glance/images/

[root@compute2 ~]# chown glance:glance *

5) 修改现有keystone中 glance服务注册信息

备份数据库endpoint表数据

[root@controller ~]# mysqldump keystone endpoint > endpoint.sql

修改keystone注册信息

cp endpoint.sql{,.bak}

sed -i 's#http://controller:9292#http://10.0.0.32:9292#g' endpoint.sql

重新将修改后的sql文件导入数据库

[root@controller ~]# mysql keystone < endpoint.sql

6) 修改nova节点配置文件

将所有的节点上的配置文件都进行修改

sed -i 's#api_servers = http://controller:9292#api_servers = http://10.0.0.32:9292#g' /etc/nova/nova.conf

控制节点重启

systemctl restart openstack-nova-api.service openstack-nova-consoleauth.service openstack-nova-scheduler.service openstack-nova-conductor.service openstack-nova-novncproxy.service

    计算节点重启

systemctl restart openstack-nova-compute.service

    停掉glance原节点的服务

systemctl stop openstack-glance-api.service openstack-glance-registry.service

7) 验证操作

在copmute2节点启动glance服务

systemctl start openstack-glance-api.service openstack-glance-registry.service

查看镜像列表

[root@controller ~]# openstack image list

+--------------------------------------+----------+--------+

| ID | Name | Status |

+--------------------------------------+----------+--------+

| 68222030-a808-4d05-978f-1d4a6f85f7dd | clsn-img | active |

| 9d92c601-0824-493a-bc6e-cecb10e9a4c6 | cirros | active |

+--------------------------------------+----------+--------+

查看web界面中的镜像信息