CentOS

Thank TrevorH.
I'm considering Rocky or CentOS 9.

And thank jlehtone, the "ss -s" only shows very little statistics, not including important info about TCP SYN queue, Listen queue, etc.

I find the reason.
Unless a counter's value is not zero, netstat will not show it.

Hello. On my CentOS 8 (release 8.5.2111), "netstat -s" does not show TCPBacklogDrop and ListenOverflows, but they exist in "/proc/net/netstat". [root@node ~]# netstat -s | egrep -i '(queue|drop|overflow)' 2 outgoing packets dropped 2 dropped because of missing route 1521 packets pruned from receive ...

Very clear explaination, thank you.

Hi. I have a 128GB RAM server and a 64GB RAM server, both running CentOS-8, "dmesg | grep Memory" outputs as follows: <128GB server> [ 0.000000] Memory: 1282732K / 133708404K available (12293K kernel code, 2225K rwdata, 7708K rodata, 2476K init, 14048K bss, 2721876K reserved, 0K cma-reserved) <64GB ...

Hello.

I create a macvlan interface:
ip link add link eth0 address 00:19:d1:29:d2:58 macvlan0 type macvlan ...

If I don't specify mode (bridge/private/vepa) during creation, is it possible to change its mode afterwards?
Or
Do I have to firstly delete it and recreate it with "mode option"?

Thanks.

Hi, hasanakgoz. I wonder why "modprobe" can interpret ip_conntrack as nf_conntrack (There not exist ip_conntrack module at all). This seems not to be related with blacklist.conf. The following is content of /etc/modprobe.d/blacklist.conf # # Listing a module here prevents the hotplug scripts from lo...

Hello. The ip_conntrack, ip_nat_ftp, ip_conntrack_ftp have been renamed to nf_conntrak, nf_nat_ftp and nf_conntrack_ftp. Further, I cannot find ip_... modules, there are only nf_... modules. But I can successfully issue "modprobe ip_conntrack", after that, with "lsmod", I see the nf_conntrack loaded...

Thank you, KermitDaFragger.

Hello.

Parameters can be set when a module is loaded by "modprobe".
If a module has already been loaded, where can I see its param?
Is there any standard/common way to do this?

Thanks.