Zabbix3.0升级Zabbix4.0

#1、停止服务
```shell
service zabbix-server stop
```
#2、新建快照 
#3、备份配置、zabbix文件
```shell
 mkdir /home/vica/zabbix-backup/
 cp /etc/zabbix/zabbix_server.conf /home/vica/zabbix-backup/
 cp /etc/apache2/conf-enabled/zabbix.conf /home/vica/zabbix-backup/
 cp -R /usr/share/zabbix/ /home/vica/zabbix-backup/
 cp -R /usr/share/doc/zabbix-* /home/vica/zabbix-backup/
```
#4、 Debian 8更新repository 配置（删除→安装）
```shell
rm -Rf /etc/apt/sources.list.d/zabbix.list
wget https://repo.zabbix.com/zabbix/4.0/debian/pool/main/z/zabbix-release/zabbix-release_4.0-2+jessie_all.deb
dpkg -i zabbix-release_4.0-2+jessie_all.deb
```
#5、升级zabbix组件
```shell
apt update
apt-get install --only-upgrade zabbix-server-mysql zabbix-frontend-php zabbix-agent
```
#6、启动zabbix组件
```shell
service zabbix-server start
service zabbix-proxy start
service zabbix-agent start
```

后续Tips： 
升级后访问页面报错
> Database error The frontend does not match Zabbix database. Current database version (mandatory/optional): 3010047/3010047. Required mandatory version: 4000000. Contact your system administrator.

手动修改版本
```sql
update dbversion set mandatory=4000000;
```
zabbix4.0字体路径(graphfont.ttf) 
`/usr/share/zabbix/assets/fonts/`

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Zabbix3.0升级Zabbix4.0

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