kexec December 2013

kexec@lists.fedoraproject.org

4 participants
6 discussions

[PATCH] ssh dump: install random-seed from a new location
by WANG Chao 20 Jan '14

20 Jan '14

In ssh dump, we use random-seed to feed /dev/urandom. In later release of systemd[1], random-seed is moved from /var/lib/random-seed to /var/lib/systemd/random-seed. We need to adapt the change and also keep backward compatibility with older systemd. [1]: http://cgit.freedesktop.org/systemd/systemd/commit/?id=ef5bfcf668e6029faa78… Signed-off-by: WANG Chao <chaowang(a)redhat.com> --- dracut-kdump.sh | 7 ++++++- dracut-module-setup.sh | 3 ++- 2 files changed, 8 insertions(+), 2 deletions(-) diff --git a/dracut-kdump.sh b/dracut-kdump.sh index 4d8616f..a7672e1 100755 --- a/dracut-kdump.sh +++ b/dracut-kdump.sh @@ -146,7 +146,12 @@ dump_ssh() echo "kdump: saving to $_host:$_dir" - cat /var/lib/random-seed > /dev/urandom + if [ -f /var/lib/random-seed ]; then + cat /var/lib/random-seed > /dev/urandom + elif [ -f /var/lib/systemd/random-seed ]; then + cat /var/lib/systemd/random-seed > /dev/urandom + fi + ssh -q $_opt $_host mkdir -p $_dir || return 1 save_vmcore_dmesg_ssh ${DMESG_COLLECTOR} ${_dir} "${_opt}" $_host diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index c013430..96009f8 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -398,7 +398,8 @@ install() { >"$initdir/lib/dracut/no-emergency-shell" if is_ssh_dump_target; then - dracut_install /var/lib/random-seed || exit $? + dracut_install -o /var/lib/random-seed || exit $? + dracut_install -o /var/lib/systemd/random-seed || exit $? fi dracut_install -o /etc/adjtime /etc/localtime inst "$moddir/monitor_dd_progress" "/kdumpscripts/monitor_dd_progress" -- 1.8.4.2

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[PATCH] ssh: use ssh -n to redirect stdin from /dev/null
by WANG Chao 15 Jan '14

15 Jan '14

When we're parsing kdump.conf, we read it from stdin in a while loop statement. If we don't use ssh -n within the loop, all rest of the kdump.conf options, which are in stdin, will be eaten by ssh. Signed-off-by: WANG Chao <chaowang(a)redhat.com> --- mkdumprd | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mkdumprd b/mkdumprd index 6de1755..43a41cb 100644 --- a/mkdumprd +++ b/mkdumprd @@ -153,7 +153,7 @@ mkdir_save_path_ssh() { local _opt _dir _opt="-i $SSH_KEY_LOCATION -o BatchMode=yes -o StrictHostKeyChecking=yes" - ssh -q $_opt $1 mkdir -p $SAVE_PATH 2>&1 > /dev/null + ssh -qn $_opt $1 mkdir -p $SAVE_PATH 2>&1 > /dev/null _ret=$? if [ $_ret -ne 0 ]; then perror_exit "mkdir failed on $DUMP_TARGET:$SAVE_PATH" @@ -165,7 +165,7 @@ mkdir_save_path_ssh() if [ $_ret -ne 0 ]; then perror_exit "Could not create temporary directory on $DUMP_TARGET:$SAVE_PATH. Make sure user has write permission on destination" fi - ssh -q $_opt $1 rmdir $_dir + ssh -qn $_opt $1 rmdir $_dir return 0 } -- 1.8.4.2

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[PATCH] fix kdump dump to nfs fails when configuring nfs dump with hostname
by Arthur Zou 22 Dec '13

22 Dec '13

Description of problem: Kdump can dump the vmcore to remote nfs target if kdump was configred by using nfs dump and nfs target was mounted before building kdump initramfs. But if we use hostname to configure nfs dump, Though the kdump service will start successfully, dump will fail because there isn't a /etc/hosts file in initramfs. Resolution: copy /etc/hosts to initramfs. Signed-off-by: arthur <zzou(a)redhat.com> --- mkdumprd | 1 + 1 file changed, 1 insertion(+) diff --git a/mkdumprd b/mkdumprd index 6de1755..d18882a 100644 --- a/mkdumprd +++ b/mkdumprd @@ -520,6 +520,7 @@ do if [ "$config_opt" = "nfs" ]; then add_dracut_module "nfs" + add_dracut_arg "--install" "/etc/hosts" fi add_mount "$config_val" mkdir_save_path_fs $config_val -- 1.8.4.2

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[PATCH v2] makedumpfile compression method default to lzo
by WANG Chao 20 Dec '13

20 Dec '13

Lzo is proven faster than zlib, for large memory machine it will extremely shorten the time for saving vmcore. Let's switch to lzo as the default compression method for makedumpfile. The drawback is lzo has a little less compression ratio than zlib. But considering for most users, speed/time is a more serious concern than vmcore size. So I think default to lzo will benefit most of the users. v1->v2: update kdump.conf.5 [DaveY] Signed-off-by: WANG Chao <chaowang(a)redhat.com> --- dracut-kdump.sh | 2 +- kdump.conf | 6 +++--- kdump.conf.5 | 16 ++++++++-------- kexec-kdump-howto.txt | 18 +++++++++--------- 4 files changed, 21 insertions(+), 21 deletions(-) diff --git a/dracut-kdump.sh b/dracut-kdump.sh index d157cd1..4d8616f 100755 --- a/dracut-kdump.sh +++ b/dracut-kdump.sh @@ -11,7 +11,7 @@ fi set -o pipefail KDUMP_PATH="/var/crash" CORE_COLLECTOR="" -DEFAULT_CORE_COLLECTOR="makedumpfile -c --message-level 1 -d 31" +DEFAULT_CORE_COLLECTOR="makedumpfile -l --message-level 1 -d 31" DMESG_COLLECTOR="/sbin/vmcore-dmesg" DEFAULT_ACTION="reboot -f" DATEDIR=`date +%Y.%m.%d-%T` diff --git a/kdump.conf b/kdump.conf index c5cfb4a..3c411fb 100644 --- a/kdump.conf +++ b/kdump.conf @@ -50,9 +50,9 @@ # automatically be populated with a config file # appropriate for the running kernel. # Default core_collector for raw/ssh dump is: -# "makedumpfile -F -c --message-level 1 -d 31". +# "makedumpfile -F -l --message-level 1 -d 31". # Default core_collector for other targets is: -# "makedumpfile -c --message-level 1 -d 31". +# "makedumpfile -l --message-level 1 -d 31". # For core_collector format details please refer to # kexec-kdump-howto.txt or kdump.conf manpage. # @@ -132,7 +132,7 @@ #ssh user(a)my.server.com #sshkey /root/.ssh/kdump_id_rsa path /var/crash -#core_collector makedumpfile -c --message-level 1 -d 31 +#core_collector makedumpfile -l --message-level 1 -d 31 #core_collector scp #kdump_post /var/crash/scripts/kdump-post.sh #kdump_pre /var/crash/scripts/kdump-pre.sh diff --git a/kdump.conf.5 b/kdump.conf.5 index 6f88370..7eaf9dd 100644 --- a/kdump.conf.5 +++ b/kdump.conf.5 @@ -78,9 +78,9 @@ for the running kernel. .PP Note 1: About default core collector: Default core_collector for raw/ssh dump is: -"makedumpfile -F -c --message-level 1 -d 31". +"makedumpfile -F -l --message-level 1 -d 31". Default core_collector for other targets is: -"makedumpfile -c --message-level 1 -d 31". +"makedumpfile -l --message-level 1 -d 31". Even if core_collector option is commented out in kdump.conf, makedumpfile is default core collector and kdump uses it internally. If one does not want makedumpfile as default core_collector, then they @@ -253,11 +253,11 @@ Above will effectively be translated to: cp --sparse=always /proc/vmcore <dest-path>/vmcore .TP ex2. -core_collector "makedumpfile -c --message-level 1 -d 31" +core_collector "makedumpfile -l --message-level 1 -d 31" Above will effectively be translated to: -makedumpfile -c --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore +makedumpfile -l --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore .PP For dump targets like raw and ssh, in general, core collector should expect one argument (source file) and should output the processed core on standard @@ -274,11 +274,11 @@ Above will effectively be translated to. cat /proc/vmcore | dd of=<target-device> .TP ex4. -core_collector "makedumpfile -F -c --message-level 1 -d 31" +core_collector "makedumpfile -F -l --message-level 1 -d 31" Above will effectively be translated to. -makedumpfile -F -c --message-level 1 -d 31 | dd of=<target-device> +makedumpfile -F -l --message-level 1 -d 31 | dd of=<target-device> .PP ssh dumps examples .TP @@ -290,11 +290,11 @@ Above will effectively be translated to. cat /proc/vmcore | ssh <options> <remote-location> "dd of=path/vmcore" .TP ex6. -core_collector "makedumpfile -F -c --message-level 1 -d 31" +core_collector "makedumpfile -F -l --message-level 1 -d 31" Above will effectively be translated to. -makedumpfile -F -c --message-level 1 -d 31 | ssh <options> <remote-location> "dd of=path/vmcore" +makedumpfile -F -l --message-level 1 -d 31 | ssh <options> <remote-location> "dd of=path/vmcore" There is one exception to standard output rule for ssh dumps. And that is scp. As scp can handle ssh destinations for file transfers, one can diff --git a/kexec-kdump-howto.txt b/kexec-kdump-howto.txt index d70781b..7ffeab9 100644 --- a/kexec-kdump-howto.txt +++ b/kexec-kdump-howto.txt @@ -438,7 +438,7 @@ is a dump filtering and compression utility provided with kexec-tools. On some architectures, it can drastically reduce the size of your vmcore files, which becomes very useful on systems with large amounts of memory. -A typical setup is 'core_collector makedumpfile -F -c --message-level 1 -d 31', +A typical setup is 'core_collector makedumpfile -F -l --message-level 1 -d 31', but check the output of '/sbin/makedumpfile --help' for a list of all available options (-i and -g don't need to be specified, they're automatically taken care of). Note that use of makedumpfile requires that the kernel-debuginfo package @@ -458,11 +458,11 @@ cp --sparse=always /proc/vmcore <dest-path>/vmcore ex2. --- -core_collector "makedumpfile -c --message-level 1 -d 31" +core_collector "makedumpfile -l --message-level 1 -d 31" Above will effectively be translated to: -makedumpfile -c --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore +makedumpfile -l --message-level 1 -d 31 /proc/vmcore <dest-path>/vmcore For dump targets like raw and ssh, in general, core collector should expect @@ -482,11 +482,11 @@ cat /proc/vmcore | dd of=<target-device> ex4. --- -core_collector "makedumpfile -F -c --message-level 1 -d 31" +core_collector "makedumpfile -F -l --message-level 1 -d 31" Above will effectively be translated to. -makedumpfile -F -c --message-level 1 -d 31 | dd of=<target-device> +makedumpfile -F -l --message-level 1 -d 31 | dd of=<target-device> ssh dumps core_collector examples: --------- @@ -500,11 +500,11 @@ cat /proc/vmcore | ssh <options> <remote-location> "dd of=path/vmcore" ex6. --- -core_collector "makedumpfile -F -c --message-level 1 -d 31" +core_collector "makedumpfile -F -l --message-level 1 -d 31" Above will effectively be translated to. -makedumpfile -F -c --message-level 1 -d 31 | ssh <options> <remote-location> "dd of=path/vmcore" +makedumpfile -F -l --message-level 1 -d 31 | ssh <options> <remote-location> "dd of=path/vmcore" There is one exception to standard output rule for ssh dumps. And that is scp. As scp can handle ssh destinations for file transfers, one can @@ -521,9 +521,9 @@ scp /proc/vmcore <user@host>:path/vmcore About default core collector ---------------------------- Default core_collector for ssh/raw dump is: -"makedumpfile -F -c --message-level 1 -d 31". +"makedumpfile -F -l --message-level 1 -d 31". Default core_collector for other targets is: -"makedumpfile -c --message-level 1 -d 31". +"makedumpfile -l --message-level 1 -d 31". Even if core_collector option is commented out in kdump.conf, makedumpfile is default core collector and kdump uses it internally. -- 1.8.4.2

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[PATCH] makedumpfile compression method default to lzo
by WANG Chao 04 Dec '13

04 Dec '13

3 4

[PATCH] Add makedumpfile.conf and its man page
by WANG Chao 04 Dec '13

04 Dec '13

makedumpfile can filter out kernel data from vmcore[1]. A how-to of feature is well explained in makedumpfile.conf, which upstream is already shipping but we're not. Now add makedumpfile.conf and its man page to our package the upstream way: makedumpfile.conf --> /etc/makedumpfile.conf.sample makedumpfile.conf.5.gz --> /usr/share/man/man5/makedumpfile.conf.5.gz [1]. http://lists.infradead.org/pipermail/kexec/2011-September/005466.html Signed-off-by: WANG Chao <chaowang(a)redhat.com> --- kexec-tools.spec | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kexec-tools.spec b/kexec-tools.spec index faf38d6..61128d0 100644 --- a/kexec-tools.spec +++ b/kexec-tools.spec @@ -209,6 +209,8 @@ install -m 755 %{SOURCE17} $RPM_BUILD_ROOT/usr/sbin/rhcrashkernel-param %ifarch %{ix86} x86_64 ia64 ppc64 s390x install -m 755 makedumpfile-1.5.4/makedumpfile $RPM_BUILD_ROOT/sbin/makedumpfile install -m 644 makedumpfile-1.5.4/makedumpfile.8.gz $RPM_BUILD_ROOT/%{_mandir}/man8/makedumpfile.8.gz +install -m 644 makedumpfile-1.5.4/makedumpfile.conf.5.gz $RPM_BUILD_ROOT/%{_mandir}/man5/makedumpfile.conf.5.gz +install -m 644 makedumpfile-1.5.4/makedumpfile.conf $RPM_BUILD_ROOT/%{_sysconfdir}/makedumpfile.conf.sample install -m 755 makedumpfile-1.5.4/eppic_makedumpfile.so $RPM_BUILD_ROOT/%{_libdir}/eppic_makedumpfile.so %endif make -C kexec-tools-po install DESTDIR=$RPM_BUILD_ROOT -- 1.8.4.2

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kexec December 2013