Web server with owin consume 100% cpu

I have a develop with owin. The application in program.cs start a web server implement with owin. That line WebApp.Start , the consume of cpu is 98%.

using (WebApp.Start(uri))

{ LOG.Info(“Webapp %CPU:” + cpuCounter.NextValue());

while (RUNNING) { };

}

The target machine has 2GB in RAM and windows 7. Why reason the cpu up to 100%? Owin has minimun requeriment ?

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Corosync caused a 100% CPU load after a node disappeared. How to fix it?

A general setup (the very first for me) of Corosync + Pacemaker is made upon 4 Virtual Servers with a VirtualIP, a private network is organised with a help of OpenVPN.

corosync-2.4.3-4.el7.x86_64 corosynclib-2.4.3-4.el7.x86_64 pacemaker-1.1.19-8.el7_6.4.x86_64 pacemaker-cli-1.1.19-8.el7_6.4.x86_64 pacemaker-cluster-libs-1.1.19-8.el7_6.4.x86_64 pacemaker-libs-1.1.19-8.el7_6.4.x86_64 pcs-0.9.165-6.el7.centos.1.x86_64 

So I have here 4 VPS with CentOS 7, running OpenVPN. The cluster status in a regular state:

# pcs status Cluster name: hacluster Stack: corosync Current DC: node2 (version 1.1.19-8.el7_6.4-c3c624ea3d) - partition with quorum Last updated: Sat Jun 15 14:00:36 2019 Last change: Sat Jun 15 02:25:39 2019 by hacluster via crmd on platinum  4 nodes configured 1 resource configured  Online: [ node1 node2 node3 master ]  Full list of resources:   virtualIP      (ocf::heartbeat:IPaddr2):       Started node1  Daemon Status:   corosync: active/enabled   pacemaker: active/enabled   pcsd: active/enabled 

Everything is running fine. Each node can ping another nodes using 172.16.172.0/24 addresses.

If I reboot a VPS the cluster stays online and virtual IP is moved to another active node. So far everything is fine.

Yesterday due to a DDoS attack an IP address from one of the nodes got black-holed. So the other 3 ones could not connect to it, and since that corosync started consume all possible CPU and even more. I had to killall -9 corosync to bring the servers back to live.

The cluster started to show all nodes are offline even the local one. Nothing helped, tried:

pcs cluster localnode remove node1 

restarted daemons, stop/start cluster, etc. CPU consumption by corosync started to grow each time it started.

I guess I missed something very obvious, and still ma I not too sure what is it exactly.

The cluster has recovered only after the failed node returned back online after 4 hours of a downtime.

Kindly let me know what I need to tune to keep the cluster online even if one-two nodes are not accessible.

Regards, Alex.

DoS attack Apache HTTP and all CPU goes 100%

We are getting a Dos attack on our web server. We enabled Cloudflare and add these rules:

If it is not SSL connection Block all. That fixed pretty much all attacks.

I would like to ask pros about this.

When I used that command :

netstat -npt | grep 80 | awk '{print $  5}' | grep -Eo '([0-9]{1,3}\.){3}[0-9]{1,3}' | cut -d: -f1 | sort | uniq -c | sort -nr | head 

Output:

 108 5.1xx.1x4.2x5  This is my server IP  59 1x8.1x4.1x1.1x1  50 162.1x8.38.196  40 1x2.x5x.93.1x9  38 1x2.1x8.226.94  37 x62.15x.88.248 

After seeing my server IP I really confused.

I block all connections to 80 port except cloudflare’s.

Right now, Some of my products I use, cannot query licenses from other servers due to blocking 80 ports.

I read some blogs it says SYN attack and my server sending response but not getting any response back so It use a lot of CPU.

How can I solve this problem with Iptables. I think attack is not big one so Iptables can handle If i use right rule.

thank you.

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