Crashkernel slides (have been missing so far...)

2 files changed, 79 insertions, 0 deletions

diff --git a/kernel-devel/kexec-and-crash-kernel/Makefile b/kernel-devel/kexec-and-crash-kernel/Makefile
new file mode 100644
index 0000000..d641258
--- /dev/null
+++ b/kernel-devel/kexec-and-crash-kernel/Makefile
@@ -0,0 +1,9 @@
+all:
+	for pdf in `ls -1 *.tex` ; do \
+		TEXINPUTS=`pwd`/../..:.:..:$(TEXINPUTS) pdflatex $$pdf; \
+		TEXINPUTS=`pwd`/../..:.:..:$(TEXINPUTS) pdflatex $$pdf; \
+	done
+
+clean:
+	rm -f *.aux *.log *.pdf *.log *.snm *.toc *.vrb *.nav *.out
+
diff --git a/kernel-devel/kexec-and-crash-kernel/pres_kexec_and_crashkernel_en.tex b/kernel-devel/kexec-and-crash-kernel/pres_kexec_and_crashkernel_en.tex
new file mode 100644
index 0000000..1791267
--- /dev/null
+++ b/kernel-devel/kexec-and-crash-kernel/pres_kexec_and_crashkernel_en.tex
@@ -0,0 +1,70 @@
+\input{configpres}
+
+\title{Kexec and Crashkernels}
+\maketitle
+\begin{frame}
+\frametitle{What is kexec?}
+Kexec is a mechanism to boot Linux from within Linux,
+without going through the BIOS / the Bootloader.
+\end{frame}
+
+\begin{frame}
+\frametitle{kexec-tools}
+http://horms.net/projects/kexec/
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Using kexec: Kernel configuration}
+\begin{verbatim}
+Boot options -->
+[*] Kexec system call
+\end{verbatim}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Using kexec: Booting the new kernel}
+\begin{verbatim}
+# Load the kernel image and set the commandline
+$ kexec -l uImage --append=$(cat /proc/cmdline)
+# Start the new kernel
+$ kexec -e
+\end{verbatim}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Using kexec: Crashkernel}
+\begin{itemize}
+\item Build production kernel (enable kexec system call!)
+\item Build ''crash kernel'' (enable kexec system call and crash dump kernel):
+\begin{verbatim}
+Boot options -->
+[*] Kexec system call
+[*] Build kdump crash kernel
+\end{verbatim}
+\item The crash kernel option should automatically select /proc/vmcore
+\end{itemize}
+\end{frame}
+
+
+\begin{frame}[fragile]
+\frametitle{Using kexec: Crashkernel}
+\begin{itemize}
+\item Boot production kernel (Commandline: crashkernel=256M@0x84000000)
+\item Check if crashkernel memory was reserved: 
+\begin{verbatim}
+cat /proc/iomem | grep Crash
+   84000000-93ffffff : Crash kernel
+\end{verbatim}
+\item Load crash kernel and let the system crash ;-)
+\begin{verbatim}
+kexec -p uImage-crash \
+  --append="$(cat /proc/cmdline | \
+    sed 's/crashkernel/bla/')"
+echo c > /proc/sysrq-trigger
+\end{verbatim}
+\item After crashing the crash kernel should boot up!
+\item Within the crashkernel the core file for the production kernel is available in /proc/vmcore
+\end{itemize}
+\end{frame}
+
+\input{tailpres}