[CentOS] CentOS 7 system running out of available memory, then unusable, network interfaces probably involved

wwp

subscript at free.fr
Tue Jun 30 08:50:54 UTC 2020


Hello John,


On Mon, 29 Jun 2020 12:54:58 -0700 John Pierce <jhn.pierce at gmail.com> wrote:

> On Mon, Jun 29, 2020 at 12:47 PM wwp <subscript at free.fr> wrote:
> 
> >
> > Nothing jumps to my eyes looking at /var/log/messages but this, many
> > occurrences:
> >   kernel: nf_conntrack: falling back to vmalloc.
> >  
> 
> nf_conntrack is only involved if you are doing some form of NAT routing on
> this system and/or fairly complex iptables kind of rules....

On this machine I do not do anything at iptables or firewall level but
opening ports for SSHD.


> you mentioned two different network interfaces, one wired, one
> wireless, how are you using these, what sort of routing between the
> two networks ?

The wired interface is directly bound to a 4G router (dhcp).
The wireless one is connected to a LAN (wifi -> wifi AP -> wire -> switch ->
wire -> router with iptables+dhcp -> wire -> xDSL box).


Regards,

-- 
wwp
https://useplaintext.email/
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