Solution: Upgrade Zabbix 3.4 -> 4.0.x

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How to Upgrade Zabbix Server 3.4.x to 4.0.x on CentOS 7 / RHEL 7


0. Prepare
Yum update wasn't done for about half a year on VM, so I did it first.
yum update

Ensure that prerequisites are installed on both server and proxinach (libpthread and zlib):
yum install glibc glibc-devel glibc-headers zlib zlib-devel

Make data server and proxy snapshot.

Continue with the (modified) upgrade procedure: https://www.zabbix.com/documentation/4.0/manual/installation/upgrade/packages/rhel_centos, but in a different order.
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