Date: Sun, 30 Dec 2001 13:17:28 +0100 From: Nils Holland <nils@tisys.org> To: =?iso-8859-1?Q?Jos=E9_Romildo_Malaquias?= <romildo@uber.com.br> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: Restoring the original kernel Message-ID: <20011230131728.A2286@tisys.org> In-Reply-To: <3C2F010B.54244A87@uber.com.br>; from romildo@uber.com.br on Sun, Dec 30, 2001 at 09:56:59AM -0200 References: <3C2F010B.54244A87@uber.com.br>
next in thread | previous in thread | raw e-mail | index | archive | help
On Sun, Dec 30, 2001 at 09:56:59AM -0200, José Romildo Malaquias stood up and spoke: > Hello. > > Being a new FreeBSD user, I do not know how to restore the original > kernel > of my system. I have recompiled the kernel and have the following > entries > in the root file system: > > -r-xr-xr-x 1 root root 2558475 Nov 23 15:10 /freebsd/kernel* > > -r-xr-xr-x 1 root root 3559066 Sep 18 15:57 > /freebsd/kernel.GENERIC* > -rwxr-xr-x 1 root root 2553628 Nov 23 13:55 > /freebsd/kernel.old* > drwxr-xr-x 2 root root 3072 Nov 23 15:10 modules/ > drwxr-xr-x 2 root root 3584 Nov 23 13:55 modules.old/ > > I believe the *.old entries refer to the previous kernel. The .old kernel is always your previous kernel. So if you installed a new kernel just now, your old kernel would by copied to kernel.old, and the previous kernel.old would be overwritten. This is useful, because in case you build a kernel that will not boot, you can always go back to your previous kernel. The kernel.GENERIC entry is the GENERIC kernel, just in the way as it was installed at the time you installed your FreeBSD system. It could theoretically be deleted, but can be helpful if you totally mess everything up (which tends to happen from time to time ;-) Hint: The modules.old directory contains your previous modules. So the relationship between modules and modules.old is just the same as with kernel and kernel.old. If you easily wanted to restore your system to your previous kernel, this should work: rm kernel mv kernel.old kernel rm modules/* mv modules.old/* modules/ reboot It is possible that you cannot simply delete your current kernel, because it my be specially protected. In order to change that, execute chflags noschg kernel before any of the commands given above. Another hint: You can also tell the FreeBSD boot loader to boot into your old kernel without actually making the old kernel the default kernel (as the above example would). That basically works by interrupting the FreeBSD boot process and telling it to boot kernel.old instead (see "man boot" for details). Greetings Nils -- Nils Holland Ti Systems - FreeBSD in Tiddische, Germany http://www.tisys.org * nils@tisys.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20011230131728.A2286>