Valeri Galtsev
2019-Oct-22 16:55 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
Hello Experts! I'm sure many of you run CentOS for some time already. My question is: is there some place that lists which of the most often used sysadmin commands are gone and what are replacements for them. Or what else one needs to do after successful installation. (in the past it was process accounting that was not enabled by default, but which gives you quite some handle in investigating compromise). I just tried quite ordinaly command of freshly installed CentOS 8: last and got an error: last: (default utx db): No such file or directory I realize that it could be just me, and I'll cope with that myself one way or another but this one prompted me to ask everybody: Is there anything I can read so I can learn what differenmt to expect on CentOS 8 from, say, CentOS 7? Thanks. Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
Leon Fauster
2019-Oct-22 17:04 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
Am 22.10.19 um 18:55 schrieb Valeri Galtsev:> ... Is there anything I can read so I can learn what differenmt to expect on CentOS 8 > from, say, CentOS 7? >https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/considerations_in_adopting_rhel_8/index -- Leon
Stephen John Smoogen
2019-Oct-22 17:20 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
On Tue, 22 Oct 2019 at 12:55, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote:> > Hello Experts! > > I'm sure many of you run CentOS for some time already. > > My question is: is there some place that lists which of the most often > used sysadmin commands are gone and what are replacements for them. Or > what else one needs to do after successful installation. (in the past it > was process accounting that was not enabled by default, but which gives > you quite some handle in investigating compromise). > > I just tried quite ordinaly command of freshly installed CentOS 8: > > last > > and got an error: > > last: (default utx db): No such file or directory >Huh. When I run it I got [root at localhost ~]# last root pts/0 192.168.1.15 Sat Oct 19 15:42 still logged in reboot system boot 4.18.0-80.11.2.e Fri Oct 18 09:39 still running root pts/1 192.168.1.15 Thu Oct 17 14:16 - 09:38 (19:22) smooge pts/1 192.168.1.15 Fri Oct 4 18:14 - 13:24 (12+19:10) smooge pts/1 192.168.1.15 Fri Oct 4 09:02 - 09:09 (00:06) smooge pts/1 192.168.1.15 Thu Oct 3 16:31 - 16:46 (00:14) smooge pts/2 192.168.1.15 Mon Sep 23 17:23 - 09:05 (15:41) smooge pts/1 192.168.1.15 Sat Sep 21 14:45 - 10:36 (5+19:51) smooge pts/1 192.168.1.15 Thu Sep 19 17:04 - 17:05 (00:01) smooge pts/1 192.168.1.15 Mon Sep 16 13:06 - 17:02 (03:55) smooge tty2 tty2 Thu Sep 12 12:43 - down (35+20:55) reboot system boot 4.18.0-80.el8.x8 Thu Sep 12 12:33 - 09:38 (35+21:05) In el7 it used to be in this package: [smooge at batcave01 ansible (master)]$ rpm -qf /usr/bin/last sysvinit-tools-2.88-14.dsf.el7.x86_64 And in el8 it is in [root at localhost ~]# rpm -qf /usr/bin/last util-linux-2.32.1-8.el8.x86_64 The wtmp file is owned by [root at localhost ~]# rpm -qf /var/log/wtmp systemd-239-13.el8_0.5.x86_64 However as you can tell from above this system has been installed for a bit so I am guessing whatever creates wtmp hasn't happened?> I realize that it could be just me, and I'll cope with that myself one > way or another but this one prompted me to ask everybody: Is there > anything I can read so I can learn what differenmt to expect on CentOS 8 > from, say, CentOS 7? > > Thanks. > Valeri > > ++++++++++++++++++++++++++++++++++++++++ > Valeri Galtsev > Sr System Administrator > Department of Astronomy and Astrophysics > Kavli Institute for Cosmological Physics > University of Chicago > Phone: 773-702-4247 > ++++++++++++++++++++++++++++++++++++++++ > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos-- Stephen J Smoogen.
Valeri Galtsev
2019-Oct-22 17:30 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
On 2019-10-22 12:20, Stephen John Smoogen wrote:> On Tue, 22 Oct 2019 at 12:55, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote: >> >> Hello Experts! >> >> I'm sure many of you run CentOS for some time already. >> >> My question is: is there some place that lists which of the most often >> used sysadmin commands are gone and what are replacements for them. Or >> what else one needs to do after successful installation. (in the past it >> was process accounting that was not enabled by default, but which gives >> you quite some handle in investigating compromise). >> >> I just tried quite ordinaly command of freshly installed CentOS 8: >> >> last >> >> and got an error: >> >> last: (default utx db): No such file or directory >> > > Huh. When I run it I got > > [root at localhost ~]# last > root pts/0 192.168.1.15 Sat Oct 19 15:42 still logged in > reboot system boot 4.18.0-80.11.2.e Fri Oct 18 09:39 still running > root pts/1 192.168.1.15 Thu Oct 17 14:16 - 09:38 (19:22)Indeed, as I suspected, it was just me. Really stupid thing: I shuffled two hostnames (one was freshly installed CentOS 8 machine, another was jail inside some FreeBSD machine...). Puzzle solved, but thanks to that I'm reading RedHat's document about what's new in RedHat 8 compared to 7, - Thank you, Leon, for link in your reply! Valeri> smooge pts/1 192.168.1.15 Fri Oct 4 18:14 - 13:24 (12+19:10) > smooge pts/1 192.168.1.15 Fri Oct 4 09:02 - 09:09 (00:06) > smooge pts/1 192.168.1.15 Thu Oct 3 16:31 - 16:46 (00:14) > smooge pts/2 192.168.1.15 Mon Sep 23 17:23 - 09:05 (15:41) > smooge pts/1 192.168.1.15 Sat Sep 21 14:45 - 10:36 (5+19:51) > smooge pts/1 192.168.1.15 Thu Sep 19 17:04 - 17:05 (00:01) > smooge pts/1 192.168.1.15 Mon Sep 16 13:06 - 17:02 (03:55) > smooge tty2 tty2 Thu Sep 12 12:43 - down (35+20:55) > reboot system boot 4.18.0-80.el8.x8 Thu Sep 12 12:33 - 09:38 (35+21:05) > > In el7 it used to be in this package: > [smooge at batcave01 ansible (master)]$ rpm -qf /usr/bin/last > sysvinit-tools-2.88-14.dsf.el7.x86_64 > > And in el8 it is in > [root at localhost ~]# rpm -qf /usr/bin/last > util-linux-2.32.1-8.el8.x86_64 > > The wtmp file is owned by > [root at localhost ~]# rpm -qf /var/log/wtmp > systemd-239-13.el8_0.5.x86_64 > > However as you can tell from above this system has been installed for > a bit so I am guessing whatever creates wtmp hasn't happened? > >> I realize that it could be just me, and I'll cope with that myself one >> way or another but this one prompted me to ask everybody: Is there >> anything I can read so I can learn what differenmt to expect on CentOS 8 >> from, say, CentOS 7? >> >> Thanks. >> Valeri >> >> ++++++++++++++++++++++++++++++++++++++++ >> Valeri Galtsev >> Sr System Administrator >> Department of Astronomy and Astrophysics >> Kavli Institute for Cosmological Physics >> University of Chicago >> Phone: 773-702-4247 >> ++++++++++++++++++++++++++++++++++++++++ >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> https://lists.centos.org/mailman/listinfo/centos > > >-- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++
David G. Miller
2019-Oct-22 18:11 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
On 10/22/19 10:55 AM, Valeri Galtsev wrote:> Hello Experts! > > I'm sure many of you run CentOS for some time already. > > My question is: is there some place that lists which of the most often > used sysadmin commands are gone and what are replacements for them. Or > what else one needs to do after successful installation. (in the past > it was process accounting that was not enabled by default, but which > gives you quite some handle in investigating compromise). > > I just tried quite ordinaly command of freshly installed CentOS 8: > > last > > and got an error: > > last: (default utx db): No such file or directory > > I realize that it could be just me, and I'll cope with that myself one > way or another but this one prompted me to ask everybody: Is there > anything I can read so I can learn what differenmt to expect on CentOS > 8 from, say, CentOS 7? > > Thanks. > Valeri > > ++++++++++++++++++++++++++++++++++++++++ > Valeri Galtsev > Sr System Administrator > Department of Astronomy and Astrophysics > Kavli Institute for Cosmological Physics > University of Chicago > Phone: 773-702-4247 > ++++++++++++++++++++++++++++++++++++++++ > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centosSaw your later response that the problem was solved but this is an interesting question that deserves an answer (and not just what changed in RHEL8).? As an example, I'm used to ifconfig and route but keep getting reminded that these commands are now deprecated and "ip" should be used instead.? Likewise for using dnf instead of yum, systemctl instead of service, firewallcmd instead of iptables, etc. I wonder how many shell scripts there are "out there" that folks have written or accumulated over the years and which now need to be updated before deprecated becomes no longer available?? Or, like using iptables instead of firewallcmd, may cause something very different than what is expected. Anyone know of any resource out there that might provide such documentation? Cheers, Dave -- "They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty." -- Benjamin Franklin
Stephen John Smoogen
2019-Oct-22 18:26 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
On Tue, 22 Oct 2019 at 14:11, David G. Miller <dave at davenjudy.org> wrote:> > On 10/22/19 10:55 AM, Valeri Galtsev wrote: > > Hello Experts! > > > > I'm sure many of you run CentOS for some time already. > > > > My question is: is there some place that lists which of the most often > > used sysadmin commands are gone and what are replacements for them. Or > > what else one needs to do after successful installation. (in the past > > it was process accounting that was not enabled by default, but which > > gives you quite some handle in investigating compromise). > > > > I just tried quite ordinaly command of freshly installed CentOS 8: > > > > last > > > > and got an error: > > > > last: (default utx db): No such file or directory > > > > I realize that it could be just me, and I'll cope with that myself one > > way or another but this one prompted me to ask everybody: Is there > > anything I can read so I can learn what differenmt to expect on CentOS > > 8 from, say, CentOS 7? > > > > Thanks. > > Valeri > > > > ++++++++++++++++++++++++++++++++++++++++ > > Valeri Galtsev > > Sr System Administrator > > Department of Astronomy and Astrophysics > > Kavli Institute for Cosmological Physics > > University of Chicago > > Phone: 773-702-4247 > > ++++++++++++++++++++++++++++++++++++++++ > > _______________________________________________ > > CentOS mailing list > > CentOS at centos.org > > https://lists.centos.org/mailman/listinfo/centos > Saw your later response that the problem was solved but this is an > interesting question that deserves an answer (and not just what changed > in RHEL8). As an example, I'm used to ifconfig and route but keep > getting reminded that these commands are now deprecated and "ip" should > be used instead. Likewise for using dnf instead of yum, systemctlI think that the deprecation of ifconfig and route was started before RHEL-7 came out.. and yet I just can't get used to them.> instead of service, firewallcmd instead of iptables, etc. I wonder how > many shell scripts there are "out there" that folks have written or > accumulated over the years and which now need to be updated before > deprecated becomes no longer available? Or, like using iptables instead > of firewallcmd, may cause something very different than what is expected. > > Anyone know of any resource out there that might provide such documentation? > > Cheers, > Dave > > -- > "They that can give up essential liberty to obtain a little temporary safety deserve neither safety nor liberty." > > -- Benjamin Franklin > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos-- Stephen J Smoogen.
Matthew Miller
2019-Oct-23 17:54 UTC
[CentOS] CentOS 8: what changed (regular UNIX admin commands)?
On Tue, Oct 22, 2019 at 12:11:04PM -0600, David G. Miller wrote:> "ip" should be used instead.? Likewise for using dnf instead of yum, > systemctl instead of service, firewallcmd instead of iptables, etc. > I wonder how many shell scripts there are "out there" that folks > have written or accumulated over the years and which now need to be > updated before deprecated becomes no longer available?? Or, likeWith the case of DNF and Yum, the RHEL team put in considerable work into making sure that the new DNF-based 'yum' command is a drop-in replacement for the vast majority of those scripts. -- Matthew Miller <mattdm at fedoraproject.org> Fedora Project Leader