<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body text="#000000" bgcolor="#FFFFFF"> <div class="moz-cite-prefix">在 2017年05月26日 09:48, dw 写道: </div> <blockquote type="cite" cite="mid:bc1edcda-cef7-b15a-aa95-00a07c53d68c@163.com"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <div class="moz-cite-prefix">在 2017年05月26日 09:42, dw 写道: </div> <blockquote type="cite" cite="mid:a1ff4a2c-6038-76b3-2671-af547d86a111@163.com"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <div class="moz-cite-prefix">在 2017年05月25日 18:54, Daniel P. Berrange 写道: </div> <blockquote type="cite" cite="mid:20170525105419.GD18049@redhat.com"> <pre wrap="">On Thu, May 25, 2017 at 06:51:40PM +0800, dw wrote: </pre> <blockquote type="cite"> <pre wrap="">在 2017年05月25日 18:37, Daniel P. Berrange 写道: </pre> <blockquote type="cite"> <pre wrap="">On Thu, May 25, 2017 at 06:20:51PM +0800, dw wrote: </pre> <blockquote type="cite"> <pre wrap="">Hi: I'm trying to connect with libvirtd with virsh from a remote PC,but only can establish 1000 connections. If try more connections,prompt: "error: failed to connect to the hypervisor error: Failed to open file '/etc/libvirt/libvirt.conf': Too many open files" I tried in another PC,also get the same prompt. Anybody know why? </pre> </blockquote> <pre wrap="">There's a limit of 1024 open file handles by default on Linux. You would have to raise that limit in /etc/security/limits.d/ for your user. </pre> </blockquote> <pre wrap="">In /etc/security/limits.d/,there is only 20-nproc.conf. </pre> </blockquote> <pre wrap="">You can create any files you want in that sub-directory - they just use the same syntax as limits.conf. It means that if RPM upgrades limits.conf it doesn't interfere with your changes in limits.d/custom.conf </pre> <blockquote type="cite"> <pre wrap="">I modified /etc/security/limits.conf,what I added is: "* soft nofile 81920 * hard nofile 81920" I also modified /etc/pam.d/login,that I added is: "session required pam_limits.so" </pre> </blockquote> <pre wrap="">I don't think that's needed - its already activated via pam.d/system-auth which is included from login. </pre> <blockquote type="cite"> <pre wrap="">The output of "ulimit -a" is: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 385898 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 81920 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 385898 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited What I did is right? </pre> </blockquote> <pre wrap="">That at least shows the new limit is active Regards, Daniel </pre> </blockquote> I restored /etc/security/limits.conf and /etc/pam.d/login. And added file /etc/security/limits.d/21-nofile.conf, the content is <blockquote> * soft nofile 10240 * hard nofile 10240" </blockquote> The output of "ulimit -a" now is: <blockquote> core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 385898 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 10240 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 385898 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited </blockquote> The related config of /etc/libvirt/libvirtd.conf is: <blockquote>max_clients = 5000 max_queued_clients = 2000 min_workers = 200 max_workers = 2000 max_requests = 5000 max_client_requests = 2000 </blockquote> Now I still get the error: <blockquote> <pre wrap="">error: failed to connect to the hypervisor error: Failed to open file '/etc/libvirt/libvirt.conf': Too many open files</pre> </blockquote> </blockquote> I tried twice,and the result is: <blockquote> virsh -c qemu+tcp://remote_pc/system error: failed to connect to the hypervisor error: Failed to open file '/etc/libvirt/libvirt.conf': Too many open files virsh -c qemu+ssh://remote_pc/system error: failed to connect to the hypervisor error: Failed to open file '/proc/4931/stat': Too many open files </blockquote> </blockquote> Hi Daniel: I have solved the problem. Not anything above need to do in my PC, the only need to do is: <blockquote>Create /etc/systemd/system/libvirtd.service.d/openfiles.conf, and write the following two lines in it: <blockquote>[Service] LimitNOFILE=2048 </blockquote> then run "service libvirtd restart",and if needed,run "systemctl daemon-reload" </blockquote> If need more connections, increase LimitNOFILE, and also need to modify /etc/libvirt/libvirtd.conf. Thank you for your help! <pre wrap="">Regards, dw </pre> </body> </html>