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2019 Apr 25
0
UEFI and PXE
...'t support secure boot at all last I looked. I also feed most of the content out via HTTP (much faster than TFTP). That includes generating menus on the fly from perl CGIs (I'm old-fashioned that way :) ). I'm using dnsmasq as my DHCP server, so I have this in its config (where pxesrv.cmadams.net has IP 10.10.10.2): ******************** # EFI boot will set ARCH option (93) dhcp-match=set:efi64,option:client-arch,7 tag-if=set:bios,tag:!efi32,tag:!efi64 # PXE boot dhcp-boot=tag:efi64,shimx64.efi,pxesrv.cmadams.net,10.10.10.2 dhcp-boot=tag:bios,bios/lpxelinux.0,pxesrv.cmadams.net,10.10....
2019 Apr 24
3
UEFI and PXE
We have a working PXE setup. I've tried to adapt it to UEFI as per RHEL6 manual, but the client won't boot. Strangely, tcpdump shows that the client tries to download all files via tftp from the dhcp server rather than the tftp server (they are different). next-server is pointing to the tftp server. Any clues?
2015 May 19
3
Problem with sieve not triggering randomly?
Once upon a time, Chris Adams <cma at cmadams.net> said: > I can confirm that a message with multiple Subject: and multiple From: > headers does not get filed correctly into the Spam folder. The > sieve-test tools shows the correct action, but when the message comes in > via LMTP, it goes into INBOX. Okay, digging some more,...
2016 Apr 27
2
systemd-journald corruption
Once upon a time, Chris Murphy <lists at colorremedies.com> said: > On Tue, Apr 26, 2016 at 3:01 PM, Chris Adams <linux at cmadams.net> wrote: > > Once upon a time, Chris Murphy <lists at colorremedies.com> said: > >> On Tue, Apr 26, 2016, 2:09 PM Chris Adams <linux at cmadams.net> wrote: > >> > I have several recently-installed CentOS 7 servers that keep having > >> > sys...
2016 Apr 26
2
systemd-journald corruption
Once upon a time, Chris Murphy <lists at colorremedies.com> said: > On Tue, Apr 26, 2016, 2:09 PM Chris Adams <linux at cmadams.net> wrote: > > I have several recently-installed CentOS 7 servers that keep having > > systemd-journald corruption > > Determined with 'journalctl --verify' or another way? I get messages like this in dmesg: [4756650.489117] systemd-journald[21364]: Failed to write...
2015 May 15
2
Problem with sieve not triggering randomly?
...older didn't exist, I have it set to be autocreated in the Dovecot config. I also know that Dovecot can write to the Spam folder okay, because I did a "doveadm move" to move several "X-Spam-Flag: YES" messages to the Spam folder, and that worked. -- Chris Adams <cma at cmadams.net>
2016 Aug 25
3
systemd not restarting daemon
...Set-up/destroy chroot environment for named-sdb... Aug 25 12:03:39 dnssql systemd: Stopped Set-up/destroy chroot environment for named-sdb. I see the file listed in the output of systemd-delta, so I know it is being seen. Any idea why systemd isn't restarting it? -- Chris Adams <linux at cmadams.net>
2016 Apr 28
2
systemd-journald corruption
...t entries. I tried that and it didn't work (at least not every time). I had to actually remove the journal file to get it functional again. So far, turning off the compression appears to have worked (but I'll have to watch it for a day or two to really see). -- Chris Adams <linux at cmadams.net>
2014 Oct 08
3
CentOS 7 kernel console under KVM?
...4cfec>] vty_init+0x174/0x174 PGD 18d3067 PUD 18d4063 PMD 3d9e1063 PTE 8000000001a4c163 If I don't do either, I can add a getty on hvc0 with "systemctl enable serial-getty at hvc0.service", but that doesn't get me the boot loader or kernel messages. -- Chris Adams <linux at cmadams.net>
2017 Feb 28
3
Systemd debug logging turned on in CentOS 7
....x86_64) 7 (Core) 1 : CentOS Linux (3.10.0-514.6.2.el7.x86_64) 7 (Core) with debugging 2 : CentOS Linux (0-rescue-7b37bcbe36eb420fb6426976c41b0aaf) 7 (Core) 3 : CentOS Linux (0-rescue-7b37bcbe36eb420fb6426976c41b0aaf) 7 (Core) with debugging On Feb 27, 2017, 8:40 PM -0500, Chris Adams <linux at cmadams.net>, wrote: > Once upon a time, Thomas Eriksson <thomas.eriksson at slac.stanford.edu> said: > > I noticed that some, but not all, of my CentOS 7 machines have these > > kernel parameters for turning on systemd debug level logging added to > > the grub.cfg file. >...
2016 Apr 26
2
systemd-journald corruption
...they are all spam-scanning servers running amavisd-new (so could be some particular pattern is triggering it). Is there a "supported" way to just cut systemd-journald out of the picture and have log entries go straight to rsyslogd? Has anyone else seen this? -- Chris Adams <linux at cmadams.net>
2019 Nov 14
2
how to know when a system is compromised
...d: > The executable could be placed on mounted read-only media That's not as secure as you think. Linux bind mounts can mount a file over another file (plus there's overlay filesystems), so it's possible to replace a binary even on a read-only device. -- Chris Adams <linux at cmadams.net>
2001 Feb 20
0
Problem with 2.5.1p1 client protocol v2
...is is after I blew away my ~/.ssh directory to make sure there was no "cruft" in it). Note that this also has the all zero key fingerprint that someone else just reported. ************************************************************************ Script started on Mon Feb 19 22:28:27 2001 cmadams:1:~$ ssh -2 -v -v -v fly OpenSSH_2.5.1p1, SSH protocols 1.5/2.0, OpenSSL 0x0090581f debug: Reading configuration data /etc/ssh/ssh_config debug: ssh_connect: getuid 500 geteuid 0 anon 0 debug: Connecting to fly [208.147.154.56] port 22. debug: Allocated local port 1022. debug: Connection establish...
2017 Jul 31
3
claiming unsused space back
Once upon a time, Warren Young <warren at etr-usa.com> said: > Zeroing the free space not only prevents inclusion of these discarded FS blocks, they compress better, too. Check out the "virt-sparsify" command - it does all of this for you. -- Chris Adams <linux at cmadams.net>
2015 Feb 04
1
Setting up Samba as fileserver for existing Windows domain
Once upon a time, Les Mikesell <lesmikesell at gmail.com> said: > On Wed, Feb 4, 2015 at 10:05 AM, Chris Adams <linux at cmadams.net> wrote: > > I have an existing office of Windows computers, in a domain, with a > > couple of Windows Server 2012 AD servers. I need to add a file server, > > so I'd prefer to use CentOS 7 and Samba to do it (because I know very > > little about Windows). Howev...
2015 Mar 06
2
leap second and Centos
On Fri, Mar 6, 2015 at 2:45 PM, Chris Adams <linux at cmadams.net> wrote: > > > So again, if you want to make sure there's no new issue, you'll have to > set up a test yourself. I doubt the 2008 or 2012 issues will happen > again, but there's plenty of room for new issues. So are you saying that you think no one upstream has d...
2015 May 15
2
Problem with sieve not triggering randomly?
...in your configuration (output from `dovecot -n`) and an > example of a message that is mishandled, I cannot tell you more. Here you go. I changed the local part of the user's email address in the spam message, and the doveadm password in the doveconf output, but that's all. http://www.cmadams.net/misc/dove/doveconf-n.txt http://www.cmadams.net/misc/dove/spam-message.txt I have three Dovecot VMs behind a pair of Dovecot director VMs; this is from the actual host that handled the delivery (all three backend hosts are showing the same issue). Users are in MySQL and mail is on NFS. There...
2015 Sep 23
3
ISC DHCP failover
...haven't had any responses. Google finds others asking about the same log message, and the only responses seem to be "well, if you get it for every update, there's probably some configuration issue" (but nobody ever says what issue might lead to it). -- Chris Adams <linux at cmadams.net>
2015 Jun 01
5
Native ZFS on Linux
...rpretation of GPL+CDDL 2: Arguing about it here will not change #1 3: CentOS ships a clone of Red Hat Enterprise Linux and so won't have things that Red Hat's lawyers don't approve (see #2) Please let it go. I think everybody here knows your opinion. -- Chris Adams <linux at cmadams.net>
2015 Apr 20
4
bash script fails conditional test
> > "-e" means "if file exists". You should use "-n" That did it!! [root at web1:~] #./bin/check-cass.sh Cassandra is running with pid: 26979 This is what the script looks like now: #!/bin/bash pid=$(ps -ef | grep cassandra | grep -v grep | grep -i -v -e grep -e screen -e s3fs|awk '{print $2}') if [[ -n $pid ]] then echo "Cassandra is