Re: [CentOS] grub.conf
One more question. I am using following grub.conf. title Linux Init Break kernel /vmlinuz root=/dev/sda6 init=/bin/sh initrd /initrd.gz Control comes to the shell command prompt. But the filesystem I am seeing is not initrd filesystem. Is it possible to access initrd file system ? Thanks Sachin On Tue, Aug 25, 2015 at 8:24 PM, Barry Brimer wrote: > > > On Tue, 25 Aug 2015, Sachin Gupta wrote: > > Thank you so much!!! >> It worked. >> >> On Tue, Aug 25, 2015 at 8:04 PM, Barry Brimer wrote: >> >> Thanks for reply. >>> >>>> >>>> I replaced break=y with init=/bin/sh. >>>> In that case case system just hangs with the following message. >>>> "Freeing unused kernel memory : 400k freed". >>>> >>>> Thanks!! >>>> Sachin >>>> >>>> On Tue, Aug 25, 2015 at 7:16 PM, Barry Brimer wrote: >>>> >>>> My grub.conf is as following. >>>> >>>>> >>>>> >>>>>> title Linux Init Break >>>>>> kernel /vmlinuz root=/dev/sda6 ro rootwait break=y >>>>>> initrd /initrd.gz >>>>>> >>>>>> What I expect is by adding *break=y* to cmdline, >>>>>> init will pause early in the boot process and launch an >>>>>> interactive sh shell which can be used for troubleshooting purposes. >>>>>> >>>>>> But kernel is disregarding break=y. And it loads up without >>>>>> launching sh shell. >>>>>> >>>>>> Is it the right way to launch interactive shell ? >>>>>> >>>>>> >>>>>> I would remove the break=y and replace it with init=/bin/sh >>>>> >>>>> What version of CentOS are you running? >>>>> >>>>> >>>> You didn't mention what version of CentOS you are running. I also >>> realized >>> that this kernel line looks a bit non-standard. What is the purpose of >>> the >>> rootwait parameter in this context? Have you tried without it but >>> including >>> init=/bin/sh ? >>> >> > You're welcome. Glad I could help. > > Barry > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] grub.conf
Thank you so much!!! It worked. On Tue, Aug 25, 2015 at 8:04 PM, Barry Brimer wrote: > Thanks for reply. >> >> I replaced break=y with init=/bin/sh. >> In that case case system just hangs with the following message. >> "Freeing unused kernel memory : 400k freed". >> >> Thanks!! >> Sachin >> >> On Tue, Aug 25, 2015 at 7:16 PM, Barry Brimer wrote: >> >> My grub.conf is as following. >>> title Linux Init Break kernel /vmlinuz root=/dev/sda6 ro rootwait break=y initrd /initrd.gz What I expect is by adding *break=y* to cmdline, init will pause early in the boot process and launch an interactive sh shell which can be used for troubleshooting purposes. But kernel is disregarding break=y. And it loads up without launching sh shell. Is it the right way to launch interactive shell ? >>> I would remove the break=y and replace it with init=/bin/sh >>> >>> What version of CentOS are you running? >>> >> > You didn't mention what version of CentOS you are running. I also realized > that this kernel line looks a bit non-standard. What is the purpose of the > rootwait parameter in this context? Have you tried without it but including > init=/bin/sh ? > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] grub.conf
Thanks for reply. I replaced break=y with init=/bin/sh. In that case case system just hangs with the following message. "Freeing unused kernel memory : 400k freed". Thanks!! Sachin On Tue, Aug 25, 2015 at 7:16 PM, Barry Brimer wrote: > My grub.conf is as following. >> >> title Linux Init Break >> kernel /vmlinuz root=/dev/sda6 ro rootwait break=y >> initrd /initrd.gz >> >> What I expect is by adding *break=y* to cmdline, >> init will pause early in the boot process and launch an >> interactive sh shell which can be used for troubleshooting purposes. >> >> But kernel is disregarding break=y. And it loads up without >> launching sh shell. >> >> Is it the right way to launch interactive shell ? >> > > I would remove the break=y and replace it with init=/bin/sh > > What version of CentOS are you running? > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] grub.conf
Hello Everyone, My grub.conf is as following. title Linux Init Break kernel /vmlinuz root=/dev/sda6 ro rootwait break=y initrd /initrd.gz What I expect is by adding *break=y* to cmdline, init will pause early in the boot process and launch an interactive sh shell which can be used for troubleshooting purposes. But kernel is disregarding break=y. And it loads up without launching sh shell. Is it the right way to launch interactive shell ? Thanks Sachin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Grub legacy on Centos 7
Hello Everyone, I am trying to use GRUB legacy with Centos 7. And it is giving me following error. systemd-fsck: fsck error 2(no such file or directory) while executing fsck.ext3 for /dev/sda5 mount:unknown file system type 'ext3'. Has anyone seen this error ? Thanks Sachin On Wed, Aug 19, 2015 at 6:51 PM, Ian Pilcher wrote: > On 08/16/2015 04:18 PM, Sachin Gupta wrote: > >> We have centos6 server. And we are planning to upgrade it to Centos7.And >> GRUB 2 needs a new bios grub partition. Creating a new partition is too >> much risky. I am wondering if it is possible to replace Grub2 with Grub >> legacy on Centos7 machine? >> > > It is definitely possible to use GRUB legacy with CentOS 7. I do it on > several systems. Note that there is a bug in the current EL 7 version > of grubby which causes the initrd line to not be added to the stanza of > newly installed kernels. > > Always check /etc/grub.conf before rebooting to a newly installed > kernel, particularly when doing so remotely. :-/ > > > -- > > Ian Pilcher arequip...@gmail.com > "I grew up before Mark Zuckerberg invented friendship" > > > > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] Centos7 Kernel Panic
Guys, I am a newbie. I am trying to load kernel from a DVD. How do I figure out where my root filesystem mounted ? Thanks Sachin On Wed, Aug 19, 2015 at 11:51 AM, Gordon Messmer wrote: > On 08/19/2015 11:20 AM, Sachin Gupta wrote: > >> I have prepared following isolinux.cfg. >> >> default linux >> label linux >>kernel /vmlinuz >>append initrd=/initrd.gz >> >> But kernel panics with the standard message 'Kernel panic - not syncing: >> No >> init found'. >> > > You haven't told Linux where to find a root filesystem. Beyond that, we'd > need more information about what you're trying to accomplish, in order to > offer useful advice. > ___ > CentOS mailing list > CentOS@centos.org > http://lists.centos.org/mailman/listinfo/centos > ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Centos7 Kernel Panic
Hello Everyone, I have prepared following isolinux.cfg. default linux label linux kernel /vmlinuz append initrd=/initrd.gz But kernel panics with the standard message 'Kernel panic - not syncing: No init found'. Linux kernel version is 3.10. I tried to read the init.txt too.But could not figure out the issue. Can you please help me figure out the problem ? Thanks Sachin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] Grub legacy on Centos 7
Hello Everyone, We have centos6 server. And we are planning to upgrade it to Centos7.And GRUB 2 needs a new bios grub partition. Creating a new partition is too much risky. I am wondering if it is possible to replace Grub2 with Grub legacy on Centos7 machine? Thanks!! Sachin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
[CentOS] grub-install
Hello Everyone, I am a newbie. When I try to install GRUB2 on centos 5.2 system, I get following error. centos5: grub-install /dev/sda //sbin/grub-setup: warn: This GPT partition label has no BIOS Boot Partition; embedding won't be possible!. //sbin/grub-setup: warn: Embedding is not possible. GRUB can only be installed in this setup by using blocklists. However, blocklists are UNRELIABLE and their use is discouraged.. //sbin/grub-setup: error: will not proceed with blocklists. Can you please help me figure out the problem ? Thanks Sachin ___ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
