On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote:> On 15/12/15 10:17 AM, Traiano Welcome wrote: >> Hi All >> >> Is it possible to upgrade from CentOS 6.7 to CentOS 7? >> >> I see there is some attempt at an upgrade tool available, but it's >> apparently broken: >> >> https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool >> >> Would anyone be able to recommend a manual upgrade procedure to >> upgrade a minimal CentOS 6.7 system to one or other version of CentOS >> 7? >> >> Many thanks in advance, >> Traiano > > Given how radically the OS changed, I would strongly advice against it. > The move from sysvinit to systemd alone is enough to recommend against > an upgrade.So it's not possible under any circumstances?> > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without > access to education? > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos
On 15/12/15 10:43 AM, Traiano Welcome wrote:> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: >> On 15/12/15 10:17 AM, Traiano Welcome wrote: >>> Hi All >>> >>> Is it possible to upgrade from CentOS 6.7 to CentOS 7? >>> >>> I see there is some attempt at an upgrade tool available, but it's >>> apparently broken: >>> >>> https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool >>> >>> Would anyone be able to recommend a manual upgrade procedure to >>> upgrade a minimal CentOS 6.7 system to one or other version of CentOS >>> 7? >>> >>> Many thanks in advance, >>> Traiano >> >> Given how radically the OS changed, I would strongly advice against it. >> The move from sysvinit to systemd alone is enough to recommend against >> an upgrade. > > > So it's not possible under any circumstances?I suppose anything is possible with enough time and effort, but I strongly recommend against it. CentOS is a server OS and as such should be used in a manner that provides maximum reliability. An upgrade in general introduces avoidable risk. An upgrade from 6 to 7 would induce far more risk than usual. Much safe to setup centos 7 fresh and migrate services over in a controlled fashion. -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?
Hi Digimer On Tue, Dec 15, 2015 at 6:54 PM, Digimer <lists at alteeve.ca> wrote:> On 15/12/15 10:43 AM, Traiano Welcome wrote: >> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: >>> On 15/12/15 10:17 AM, Traiano Welcome wrote: >>>> Hi All >>>> >>>> Is it possible to upgrade from CentOS 6.7 to CentOS 7? >>>> >>>> I see there is some attempt at an upgrade tool available, but it's >>>> apparently broken: >>>> >>>> https://wiki.centos.org/TipsAndTricks/CentOSUpgradeTool >>>> >>>> Would anyone be able to recommend a manual upgrade procedure to >>>> upgrade a minimal CentOS 6.7 system to one or other version of CentOS >>>> 7? >>>> >>>> Many thanks in advance, >>>> Traiano >>> >>> Given how radically the OS changed, I would strongly advice against it. >>> The move from sysvinit to systemd alone is enough to recommend against >>> an upgrade. >> >> >> So it's not possible under any circumstances? > > I suppose anything is possible with enough time and effort, but I > strongly recommend against it. > > CentOS is a server OS and as such should be used in a manner that > provides maximum reliability. An upgrade in general introduces avoidable > risk. An upgrade from 6 to 7 would induce far more risk than usual. > > Much safe to setup centos 7 fresh and migrate services over in a > controlled fashion.I'm aware and appreciative of these risks. However, given the unique situation I need to address, it's worth spending the time needed to attempt this. If some tweaking, and a moderate amount of head-wall contact is required, that's ok. If there is any method that provides a reasonable approximation of success, I'd be thankful if you could point me to it.> > -- > Digimer > Papers and Projects: https://alteeve.ca/w/ > What if the cure for cancer is trapped in the mind of a person without > access to education? > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos
Traiano Welcome wrote:> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: >> On 15/12/15 10:17 AM, Traiano Welcome wrote: >>> >>> Is it possible to upgrade from CentOS 6.7 to CentOS 7?<snip>>> Given how radically the OS changed, I would strongly advice against it. >> The move from sysvinit to systemd alone is enough to recommend against >> an upgrade. > > So it's not possible under any circumstances?Let me offer you one option: *IF* you have enough space on your filesystems, you could: mkdir /boot/old /old zsh zmodload zsh/files mv /boot/* /boot/old/ mv /usr /old/ mv /lib* /old/ sync sync And go into the installer. If you have a problem, you can go back.... mark
On 15/12/15 11:10 AM, m.roth at 5-cent.us wrote:> Traiano Welcome wrote: >> On Tue, Dec 15, 2015 at 6:36 PM, Digimer <lists at alteeve.ca> wrote: >>> On 15/12/15 10:17 AM, Traiano Welcome wrote: >>>> >>>> Is it possible to upgrade from CentOS 6.7 to CentOS 7? > <snip> >>> Given how radically the OS changed, I would strongly advice against it. >>> The move from sysvinit to systemd alone is enough to recommend against >>> an upgrade. >> >> So it's not possible under any circumstances? > > Let me offer you one option: *IF* you have enough space on your > filesystems, you could: > mkdir /boot/old /old > zsh > zmodload zsh/files > mv /boot/* /boot/old/ > mv /usr /old/ > mv /lib* /old/ > sync > sync > And go into the installer. If you have a problem, you can go back.... > > markHow would the move from the old to new grub work, particularly in reverse if needed? -- Digimer Papers and Projects: https://alteeve.ca/w/ What if the cure for cancer is trapped in the mind of a person without access to education?