nginx automatic failover load balancing
I'm using nginx and NginxHttpUpstreamModule for loadbalancing. My config is very simple: upstream lb { server 127.0.0.1:8081; server 127.0.0.1:8082; } server { listen 89; server_name localhost; location / { proxy_pass http://lb; proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; } } But with this co
IPTABLES - Limit rate of a specific incoming IP
IPTables isn't made for this kind of work, where lots and lots of packets need to be analyzed to make these decisions. IPTables is partly the answer though! The real answer to this is the awesome and underused traffic control facilities in Linux. Note that mucking around with this without knowing what is going on may lead to you losing network connectivity to the machine! You have been warned! Ass
Ganglia without multicast
I'm running Ganglia 3.1.2 on a network where there is no multicast (nor can I turn it on). Does anyone have an elegant solution for getting ganglia to work correctly? I found this: http://code.google.com/p/ganglia-multicast-hack/ but it does not scale very well. Right now, I have separate data_source lines for each host on my network in my gmetad.conf file, but that too does not scale well, and I
"Possible SYN flooding" in log despite low number of SYN_RECV connections
Recently we had an apache server which was responding very slowly due to SYN flooding. The workaround for this was to enable tcp_syncookies (net.ipv4.tcp_syncookies=1 in /etc/sysctl.conf). I posted a question about this here if you want more background. After enabling syncookies we started seeing the following message in /var/log/messages approximately every 60 seconds: [84440.731929] possible SYN
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