Another thing to look at is to restart the apache process and see memory usage. You can either use top. Or you can use a cron job which emails you the output of:
ps -e -o rsz,vsz,sz,cp,cmd | grep apache2 | grep -v grep | sort -k 1 -n
to see if you start or if it grows gradually
-----Original Message-----
From: Jason Long <hack3rcon@xxxxxxxxx.INVALID>
Sent: 12 January 2021 10:01
To: users@xxxxxxxxxxxxxxxx
Subject: Re: Aw: Re: [users@httpd] Apache in under attack. [EXT]
I did below rule, but not worked:
# iptables -A INPUT -p tcp --syn --dport 80 -m connlimit --connlimit-above 20 -j REJECT --reject-with tcp-reset
On Tuesday, January 12, 2021, 01:15:40 PM GMT+3:30, Florian Schwalm <flo@xxxxxxxxxxxx> wrote:
It can be done with iptables or take a look at fail2ban:
https://urldefense.proofpoint.com/v2/url?u=https-3A__security.stackexchange.com_q_35773_213194&d=DwIFaQ&c=D7ByGjS34AllFgecYw0iC6Zq7qlm8uclZFI0SqQnqBo&r=oH2yp0ge1ecj4oDX0XM7vQ&m=I9F0cXVKI5lNIkmNjSJUj4c7qqr061vJX88jzcMLpvA&s=_jkuSoCIH2P5CqYmZuedFXUmuuq3Uf5PkIKE5nk_B3o&e=
Am 12.01.21, 10:26 schrieb Jason Long <hack3rcon@xxxxxxxxx.INVALID>:
> Thank you, but "Firewalld" or "iptables" can't do it automatically? When an IP sending many request then it automatically blocked.
>
>
>
>
>
>
> On Tuesday, January 12, 2021, 12:49:50 PM GMT+3:30, James Smith <js5@xxxxxxxxxxxx> wrote:
>
>
>
>
>
> Jason,
>
> I would also query why your process are ~ 1G resident that seems quite large for apache.
>
> What modules do you have enabled - even with mod_perl embedded I would not want them to go about 500-800M depending on the site of your box.
>
> I know Apache is very good at grabbing memory for each process - but it doesn't tend to hand it back - and just keeps it (just in case)
>
> It looks like you either have a memory leak - or the code is collecting too much data before squirting it out
>
> There are other setups that you may want to look at if you have large dynamic requests and a lot of small static request (images/css/js) where you run two web servers - one serving static content and proxying back to dynamic content.
>
> James
>
> -----Original Message-----
> From: James Smith <js5@xxxxxxxxxxxx>
> Sent: 12 January 2021 09:09
> To: users@xxxxxxxxxxxxxxxx
> Subject: RE: Apache in under attack. [EXT]
>
> Put a firewall rule into block whatever that first IP address is then.
>
> Something like:
>
> firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='X.X.X.X' reject"
>
> If you are seeing a current attack then you can tweak Charles' command line to:
>
> tail -10000 access.log | awk '{print $1}' | sort | uniq -c | sort -nr | head
>
> or I often use cut instead of awk..
>
> tail -10000 access.log | cut -d ' ' -f 1 | sort | uniq -c | sort -nr | head
>
> -----Original Message-----
> From: Jason Long <hack3rcon@xxxxxxxxx.INVALID>
> Sent: 12 January 2021 08:53
> To: users@xxxxxxxxxxxxxxxx
> Subject: Re: Apache in under attack. [EXT]
>
> It show me:
>
> 13180 X.X.X.X
> 1127 X.X.X.X
> 346 X.X.X.X
> 294 X.X.X.X
> 241 X.X.X.X
> 169 X.X.X.X
> 168 X.X.X.X
> 157 X.X.X.X
> 155 X.X.X.X
> 153 X.X.X.X
>
>
>
>
>
>
>
>
> On Tuesday, January 12, 2021, 07:12:22 AM GMT+3:30, Bender, Charles <charles@xxxxxxxxxxxxxxx.invalid> wrote:
>
>
>
>
>
> Run this against your log file in bash shell
>
> cat access.log | awk '{print $1}' | sort | uniq -c | sort -nr | head
>
> This will show you most frequent IPs, sorted in descending order. Block as needed
>
> On 1/11/21, 7:11 PM, "Jason Long" <hack3rcon@xxxxxxxxx.INVALID> wrote:
>
> Can you help me?
>
>
>
>
>
>
> On Tuesday, January 12, 2021, 03:36:30 AM GMT+3:30, Nick Folino <nick@xxxxxxxxx> wrote:
>
>
>
>
>
> Concentrate on just one...
>
> On Mon, Jan 11, 2021 at 7:02 PM Jason Long <hack3rcon@xxxxxxxxx.invalid> wrote:
> > It is a lot of IP addresses !!!
> >
> >
> >
> >
> >
> >
> > On Tuesday, January 12, 2021, 03:30:02 AM GMT+3:30, Nick Folino <nick@xxxxxxxxx> wrote:
> >
> >
> >
> >
> >
> > How to find pattern:
> > Look at log.
> > Find bad things that are similar.
> >
> > Then:
> > Block bad things from reaching web server.
> >
> > On Mon, Jan 11, 2021 at 6:49 PM Jason Long <hack3rcon@xxxxxxxxx.invalid> wrote:
> >> How to find pattern?
> >> Log show me: https://urldefense.proofpoint.com/v2/url?u=https-3A__paste.ubuntu.com_p_MjjVMvRrQc_&d=DwIFaQ&c=D7ByGjS34AllFgecYw0iC6Zq7qlm8uclZFI0SqQnqBo&r=oH2yp0ge1ecj4oDX0XM7vQ&m=3PjPryDoNL3lr2gh0F6gLkL-pFWSat8aihqbLnBMag8&s=iTeaVG53Ne-jiAhMis6h9nlKBdUrWXhIuky31GQhURE&e=
> >>
> >>
> >>
> >>
> >>
> >>
> >> On Tuesday, January 12, 2021, 03:06:12 AM GMT+3:30, Filipe Cifali <cifali.filipe@xxxxxxxxx> wrote:
> >>
> >>
> >>
> >>
> >>
> >> Yeah it's probably not going to matter if you don't know what's attacking you before setting up the rules, you need to find the patterns, either the attack target or the attackers origins.
> >>
> >> On Mon, Jan 11, 2021 at 8:26 PM Jason Long <hack3rcon@xxxxxxxxx.invalid> wrote:
> >>> I used a rule like:
> >>>
> >>> # firewall-cmd --permanent --zone="public" --add-rich-rule='rule port port="80" protocol="tcp" accept limit value="100/s" log prefix="HttpsLimit" level="warning" limit value="100/s"'
> >>>
> >>> But not matter.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> On Tuesday, January 12, 2021, 02:47:01 AM GMT+3:30, Filipe Cifali <cifali.filipe@xxxxxxxxx> wrote:
> >>>
> >>>
> >>>
> >>>
> >>>
> >>> You need to investigate your logs and find common patterns there, also there are different tools to handle small and big workloads like you could use iptables/nftables to block based on patterns and number of requests.
> >>>
> >>> On Mon, Jan 11, 2021 at 8:06 PM Jason Long <hack3rcon@xxxxxxxxx.invalid> wrote:
> >>>> Hello,
> >>>> On a CentOS web server with Apache, someone make a lot of request and it make slowing server. when I disable "httpd" service then problem solve. How can I find who made a lot of request?
> >>>> [url]https://urldefense.proofpoint.com/v2/url?u=https-3A__imgur.com_O33g3ql-5B_url-5D&d=DwIFaQ&c=D7ByGjS34AllFgecYw0iC6Zq7qlm8uclZFI0SqQnqBo&r=oH2yp0ge1ecj4oDX0XM7vQ&m=3PjPryDoNL3lr2gh0F6gLkL-pFWSat8aihqbLnBMag8&s=5Qu-cdmn037VIUfExtigktWPBBJ7lby836voIoSO_y0&e=
> >>>> Any idea to solve it?
> >>>>
> >>>>
> >>>> Thank you.
> >>>>
> >>>> ---------------------------------------------------------------------
> >>>> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
> >>>> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
> >>>>
> >>>>
> >>>
> >>>
> >>> --
> >>> [ ]'s
> >>>
> >>> Filipe Cifali Stangler
> >>>
> >>>
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
> >>> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
> >>>
> >>>
> >>
> >>
> >> --
> >> [ ]'s
> >>
> >> Filipe Cifali Stangler
>
> >>
> >>
> >> ---------------------------------------------------------------------
> >> To unsubscribe, e-mail: users-unsubscribe@xxxxxxxxxxxxxxxx
> >> For additional commands, e-mail: users-help@xxxxxxxxxxxxxxxx
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