http://www.unix.devsitehosting.com Unix - Unix Like Operating Systems Sun, 26 Aug 2007 12:18:54 +0000 http://backend.userland.com/rss092 en The problem here is that savecore needs to use a kernel file to build the dump image. By default, savecore uses the booting kernel. If you are booting off a different kernel after a panic, you must run savecore manually to tell it where to find the proper ... http://www.unix.devsitehosting.com/2007/08/26/the-problem-here-is-that-savecore-needs-to/ Dumpon Now it's time to tell the system where to write the core dump this location is the dumpdev. FreeBSD uses the swap partition as the dump device, which is why it has to be slightly larger than your physical memory. (You can use a UFS ... http://www.unix.devsitehosting.com/2007/08/25/dumpon-now-its-time-to-tell-the-system/ .................................................................................................... options DDB makeoptions DEBUG=-g .................................................................................................... The DDB option installs the DDB kernel debugger. (This isn't strictly necessary, but it can be helpful and it doesn't take up that much room.) The makeoptions you set here tell the system to build a debugging kernel. ... http://www.unix.devsitehosting.com/2007/08/25/options-ddb-makeoptions-debug-g-the-ddb/ panic happens. Set it up when you install the server. That way, you'll get a backtrace automatically if it ever crashes. This might seem like a novel idea, and it certainly isn't emphasized in the FreeBSD documentation, but it makes sense to be ready for disaster. If it ... http://www.unix.devsitehosting.com/2007/08/24/panic-happens-set-it-up-when-you-install/ code segment = base 0x0, limit 0xfffff, type 0x1b = DPL 0, pres 1, def32 1, gran 1 processor eflags = interrupt enabled, resume, IOPL=0 current process = 5 (syncer) interrupt mask = bio trap number = 12 panic: page fault .................................................................................................... If you're an ... http://www.unix.devsitehosting.com/2007/08/24/code-segment-base-0x0-limit-0xfffff-type/ Chapter 20: System Crashes and Panics One of the nice things about FreeBSD is its stability; the only Blue Screen of Death is a screensaver. In fact, it was almost a year before I realized that a FreeBSD machine could crash for reasons other than bad ... http://www.unix.devsitehosting.com/2007/08/23/chapter-20-system-crashes-and-panics-one-of/ by a huge amount. 451 Note: If you are looking for good and high quality web space to host and run your application check Lunarwebhost Cheap Web Hosting services http://www.unix.devsitehosting.com/2007/08/23/by-a-huge-amount-451/ .................................................................................................... Network Traffic Just for completeness, let's look at a sample of how to measure network traffic. This assumes a 10Mbps network connection; if you're using 100BaseT, multiply MaxBytes by 10. .................................................................................................... Title[myhost.AbsoluteBSD.com.traffic]: myhost.AbsoluteBSD.com network traffic MaxBytes[myhost.AbsoluteBSD.com.traffic]: 125000 WithPeak[myhost.AbsoluteBSD.com.traffic]: wmy Target[myhost.AbsoluteBSD.com.traffic]: public@myhost.AbsoluteBSD.com Options[myhost.AbsoluteBSD.com.traffic]: ... http://www.unix.devsitehosting.com/2007/08/22/network-traffic-just-for-completeness-lets-look/ LegendO[myhost.AbsoluteBSD.com.cpu]: System CPU Legend1[myhost.AbsoluteBSD.com.cpu]: User Processor Usage Legend2[myhost.AbsoluteBSD.com.cpu]: System Processor Usage Legend3[myhost.AbsoluteBSD.com.cpu]: Maximal 5 Minute User Processor Usage Legend4[myhost.AbsoluteBSD.com.cpu]: Maximal 5 Minute System Processor Usage Options[myhost.AbsoluteBSD.com.cpu]: growright, gauge PageTop[myhost.AbsoluteBSD.com.cpu]: CPU usage for myhost.AbsoluteBSD.com .................................................................................................... Swap Usage Before you can measure swap space, you'll need to ... http://www.unix.devsitehosting.com/2007/08/21/legendomyhostabsolutebsdcomcpu-system-cpu-legend1myhostabsolutebsdcomcpu-user-processor-usage-legend2myhostabsolutebsdcomcpu/ Options[label]: option-names Options allow you to handle special cases. All options are specified on one line, after the target. Some good examples follow: growright By default, MRTG draws graphs from right to left. Use this option to make it draw graphs from left ... http://www.unix.devsitehosting.com/2007/08/21/optionslabel-option-names-options-allow-you-to-handle-special/