Linux support from dell is still very poor. They still support only RedHat$ and SuSE$. But there are ways to check the Raid status of Dell server on debian. http://hwraid.le-vert.net/ is doing a good job in collecting information and building Debian style packages. Example: A Dell server “PowerEdge T130” with “LSI Logic / Symbios Logic MegaRAID SAS-3 […]
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Problem: PaloAlto firewall is dropping packets in small bursts of some seconds, and sometimes it drops TCP connections. It only happens on HA clusters on interfaces in active/passive (fail over) mode. Solution: disable the following check box in the Ethernet interface Advanced – LLDP settings: “Enable in HA Passive State” Discussion: Palo Alto uses only one MAC address
PaloAlto Packet Loss of 1% and More Read More »
Problem: Cisco ASR router is loosing connectivity to its directly attached Ethernet neighbors. In this situation interface status is still up, packets are going in and out on both ends, even IPv6 was still working. The actual problem was that the Cisco ASR was ignoring all ARP responses from its neighbors and the ARP table to this
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Problem: for some PDF files cups does not print the page, the web gui just tells “filter failed” and in the cups logfile you find [Job 528] PID 19521 (gs) crashed on signal 11! Discussion: cups on debian uses ghostscript as pdf renderer. The pdf renderer of ghostsciprt crashes on many files. You can test by simply running
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I believe that it’s a good idea that vi does not auto save during editing. Think of config files or src files that should never be in an inconsistent state. The programmer or sysadmin should decide when he wants to save data. But sometime auto save is handy, while typing lists like todo lists or
I had to upgrade several F5 load balancers from 11.5 to 12.1 in the last weeks. Usually updating F5 is quiet easy, but there are bugs or annoyances you should know: Sometimes F5 asks for re-activating after the first boot into the new version. It seems that you have to install the new version in a
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Problem: after upgrading from Debian 6 to Debian 8 some of the machines lose their ethernet network connection under heavy load for some seconds rarely. You find lines like these in syslog: [2333099.217735] NETDEV WATCHDOG: eth1 (tg3): transmit queue 0 timed out [2333099.217966] tg3 0000:03:04.1 eth1: transmit timed out, resetting [2333099.384391] tg3 0000:03:04.1 eth1: 0: Host
Rare Connection Resets after Linux Upgrade Read More »
Problem: after compiling sendmail on Debian7 with “./Build” sendmail does not recognize hash .db files. You see the following error message: readcf: map access: class hash not available Discussion: ./Build should detect the berkley DB automatically. When devtools/bin/configure.sh finds libdb.so it adds -DNEWDB as compile option. On Debian7 the libdb.so file moved to /usr/lib/x86_64-linux-gnu/ and configure.sh fails to
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Problem: A responsive webapp shows a google map with markers that are clickable. On desktop everything works as expected, but on mobile the markers are not clickable. Discussion: After debugging with chrome remote inspector, I found that a div->frame with opacity:0 was lying above (explicit z-index:2) the clickable markers. I don’t know what this frame is for,
Google Maps Marker on Mobile Read More »
Problem: F5 LTM is used als load balancer for multiple web servers. When the client opens a websocket connection to the web server, the connection is closed. Discussion: F5 LTM version before 11.6.0 has a bug in the request_log module (profile). The “request_log” module crashes and drops the connection. The bug is a known issue: https://support.f5.com/kb/en-us/solutions/public/16000/600/sol16690.html Solution: If you
F5 Drops WebSockets Read More »