Check_MK Werk 0970: liveproxyd: handle situations with more then 1024 open files

ID: 0970 Title: liveproxyd: handle situations with more then 1024 open files Component: Livestatus-Proxy Level: 2 Class: Bug Fix Version: 1.2.5i3 When you are using the Livestatus Proxy Daemon for connecting lots of sites and you have lots of concurrent users then two things could happen: 1. You might run out of files. The reason is that per default on most Linux systems the number of files a process is allowed to keep open is limited to 1024. The can be increased by using <tt>/etc/security/limits.conf</tt>. The script launching the <tt>liveproxyd</tt> need to issue a <tt>ulimit -S -n unlimited</tt> before starting. In the OMD builds of the Check_MK Monitoring System this has been added for recent development builds. The <tt>liveproxyd</tt> now handles this situation better and does not long run into a busy CPU loop. It waits for 5 seconds and restarts itself instead. 2. Even if you increased the number of allowed open files the <tt>liveproxyd</tt> could never open more than 1024 files on most Python versions (due to a limit of the system call <tt>select()</tt>. This has been fixed by using the <tt>poll()</tt> system call.