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Mate from EPEL
by James Pearson 07 Jan '19

07 Jan '19

Slightly off topic, but might be of interest to people using Mate on CentOS 7 from EPEL ... I've just had a comment added to a open Bugzilla report I have with Mate from EPEL, where the current EPEL/Mate maintainer (Wolfgang Ulbrich <fedora at raveit.de>) just states: New maintainer is wanted for MATE epel7 repo! (it looks like he has added this comment to all open EPEL/Mate BZ's) So I guess if anyone is interested in taking over as EPEL/Mate maintainer - then contact fedora at raveit.de ... James Pearson

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how to set proxy systemwide (wget and docker)
by Ralf Prengel 07 Jan '19

07 Jan '19

Hallo, what is the right way to set a proxy systemwide using centos 7? I need this for wget and docker. My first idea was /etc/environment but allthough the proxy is set wget and docker don‘ t connect to their target-systems. Thanks for hints Ralf

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Docker on Centos 7
by H 07 Jan '19

07 Jan '19

I recently updated docker to version 18.09 and I seem to have lost the container id in the command prompt when I exec into a running container, a very useful feature in the previous version I was running. I have not found any information in the Docker General Forum. Has anyone else seen this?

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Mail server with both postfix and sendmail installed, active MTA gets switched.
by Lamar Owen 05 Jan '19

05 Jan '19

Ok, so a bit of a long subject line there... I'm running an email server using postfix, but a critical third-party package being used requires 'sendmail' the package. No, I can't uninstall that package, please don't suggest that, and I don't have control of its requires. So both postfix and sendmail are installed, and that's just the way it has to be. Amavisd-new and clamav/clamd, from EPEL are also installed. I have had updates twice now switch the active MTA to sendmail, and I have to manually 'systemctl disable sendmail; systemctl stop sendmail' and 'systemctl enable postfix;systemctl start postfix' afterwards. I am trying to find out what package update caused this to switch; or which logfile to look at to show me the systemctl messages that show the enable/disable sequence and points me to the correct package to file the bug against. The packages updated today when this happened were: # cat /var/log/yum.log Jan 04 16:42:47 Updated: clamav-filesystem-0.101.0-1.el7.noarch Jan 04 16:42:48 Updated: clamav-lib-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-update-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamd-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-server-systemd-0.101.0-1.el7.x86_64 Jan 04 16:42:48 Updated: clamav-scanner-systemd-0.101.0-1.el7.x86_64 Jan 04 16:42:49 Updated: clamav-0.101.0-1.el7.x86_64 Jan 04 16:42:54 Updated: clamav-data-0.101.0-1.el7.noarch Jan 04 16:42:55 Updated: python2-certbot-apache-0.29.1-1.el7.noarch # Sendmail hasn't had updated packages in a long time, since August 2017. None of the package scriptlets from the above packages look like they would affect the sendmail setup. So, I'm looking for suggestions on where to start looking for the data to ferret this out; no clues are in /var/log/messages or /var/log/yum.log.

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thunderbird & firefox
by mark 05 Jan '19

05 Jan '19

I *really* dislike the new photon UI. I WANT the arrow buttons top and bottom of the scrollbars. Does anyone know how to bring them back, or is that "that's *sooo* last year, you can't ever have them again"? mark

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How to troubleshoot partial shutdown problem?
by Marko Vojinovic 04 Jan '19

04 Jan '19

Hi folks, I've never encountered the following problem before (but I guess there is a first time for everything) --- after issuing a regular shutdown, the system starts the shutdown procedure, but stalls at some point, and never finishes. It gets to the console, writes the "powering down" message and stops there --- the hardware never actually powers off. At that time, the machine is completely unresponsive to anything, I have to hold the power button for 5 seconds to actually force it to turn off. This is a clean install of C7, fully updated. I doubt that hardware is at fault, since it *does* properly shut down when I boot it from the C7 live usb (which was used to install the system in the first place). The only difference is that the live usb is not updated at all, while the os on the hard drive has received cca 1000 updates after initial installation. So I'm guessing that something in the updates broke something in the shutdown procedure. Btw, rebooting the machine works properly, no issues. How am I to troubleshoot this? Most importantly, what is the best way to check (after the power cycle) if the hard drive had been unmounted properly during the previous shutdown, i.e. if the unmounting finished before the stall? I don't want the hard drive to "suffer" from unclean shutdowns, if possible. Also, what piece of code prints the "powering off" message in the console (since that appears to be the last thing working)? What else to look for, and where? Is this maybe a known issue, is there a fix? Other than shutting down, the machine works completely ok, so arguably this is not such a big problem (as I plan to have it running 24/7), but still, failing to shutdown when I want it to feels somewhat disturbing, I'd rather have that fixed. Any suggestions? Best, :-) Marko P.S. Happy new year to everyone! ;-)

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OT: but if anyone here knows...
by Fred Smith 04 Jan '19

04 Jan '19

I know this is offtopic, but I hope someone here can give me some guidance. I'm attempting to build sleepyhead (not even on Centos, so it is really OT) and I hit this error: Project ERROR: Unknown module(s) in QT: help Makefile:44: recipe for target 'sub-sleepyhead-make_first-ordered' failed make: *** [sub-sleepyhead-make_first-ordered] Error 3 I don't know anything about using QT, and I've spent hours trying to find a solution to this. there is a qt5help module and it is installed, and I haven't been smart enough to figure out what else this needs. thanks in advance! -- ---- Fred Smith -- fredex(a)fcshome.stoneham.ma.us ----------------------------- But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. ------------------------------- Romans 5:8 (niv) ------------------------------

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Measure system resources consumptions by ClamAV File scanner
by Kaushal Shriyan 03 Jan '19

03 Jan '19

Hi, I am running ClamAV process which is invoked by Cron scheduler around 3:00 AM ( Midnight) on remote server running CentOS Linux release 7.6.1810 (Core). Is there a way to measure what was the system resources consumptions like CPU, Network, I/O, Memory and Computing load is being used and is it possible to find out how much time it took to complete the scan? Any help will be highly appreciated. Thanks in Advance. Best Regards, Kaushal

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install AWX without docker
by Ralf Prengel 03 Jan '19

03 Jan '19

Hallo, I want to use awx without docker for the moment and found this tutorial: https://www.howtoforge.com/tutorial/centos-ansible-awx-installation/ Are there any other docs available? Thanks for hints Ralf Von meinem iPad gesendet

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Erratic local hostname resolution with Dnsmasq
by Nicolas Kovacs 03 Jan '19

03 Jan '19

Hi, My local server is running CentOS 7. The machine has two NICs and is acting as a gateway. For DHCP and DNS, I'm using Dnsmasq. I have a strange little problem with local hostname resolution. Before going into more details, here's my configuration. [root@nestor:~] # ifconfig enp2s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.0.2 netmask 255.255.255.0 broadcast 192.168.0.255 ether 2c:27:d7:15:54:a1 txqueuelen 1000 (Ethernet) RX packets 17122 bytes 17596130 (16.7 MiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 13426 bytes 2144915 (2.0 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 18 memory 0xfe8e0000-fe900000 enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.2.1 netmask 255.255.255.0 broadcast 192.168.2.255 ether 00:22:64:8a:4c:c2 txqueuelen 1000 (Ethernet) RX packets 6597320 bytes 9692134059 (9.0 GiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 534283 bytes 57365155 (54.7 MiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 device interrupt 16 memory 0xfe9e0000-fea00000 [root@nestor:~] # cat /etc/hostname nestor [root@nestor:~] # cat /etc/hosts # /etc/hosts 127.0.0.1 localhost.localdomain localhost 192.168.2.1 nestor.microlinux.lan nestor 192.168.2.252 hp-officejet.microlinux.lan hp-officejet 192.168.2.253 nas.microlinux.lan nas 192.168.2.254 wifi.microlinux.lan wifi [root@nestor:~] # cat /etc/resolv.conf # /etc/resolv.conf nameserver 127.0.0.1 [root@nestor:~] # cat /etc/dnsmasq.conf # /etc/dnsmasq.conf domain-needed bogus-priv interface=enp3s0 dhcp-range=192.168.2.100,192.168.2.200,24h local=/microlinux.lan/ domain=microlinux.lan expand-hosts # Cloudflare server=1.1.1.1 server=1.0.0.1 # Google #server=8.8.8.8 #server=8.8.4.4 no-resolv # Google dhcp-host=D4:85:64:B2:B2:1B,alphamule,192.168.2.2 dhcp-host=00:1E:C9:43:A7:BF,bernadette,192.168.2.3 dhcp-host=00:1D:09:15:4A:D8,raymonde,192.168.2.4 dhcp-host=00:1E:C9:42:84:7B,amandine,192.168.2.5 dhcp-host=B8:CA:3A:D6:5A:43,1C:3E:84:32:7E:87,buzz,192.168.2.6 dhcp-host=90:E6:BA:CF:04:8F,64:70:02:9A:AC:93,balthazar,192.168.2.7 dhcp-host=08:00:27:00:00:01,centosbox,192.168.2.10 dhcp-host=08:00:27:00:00:02,susebox,192.168.2.11 dhcp-host=10:62:E5:D4:95:60,hp-officejet,192.168.2.252 dhcp-host=00:11:32:26:63:A5,nas,192.168.2.253 Now here's the problem. Some of the hostname are correctly resolved, while others are not. Here's what it looks like when invoked from the server. [root@nestor:~] # host alphamule alphamule has address 192.168.2.2 [root@nestor:~] # host bernadette bernadette has address 192.168.2.3 [root@nestor:~] # host raymonde Host raymonde not found: 3(NXDOMAIN) [root@nestor:~] # host amandine Host amandine not found: 3(NXDOMAIN) [root@nestor:~] # host buzz [root@nestor:~] # host balthazar balthazar has address 192.168.2.7 [root@nestor:~] # host centosbox Host centosbox not found: 3(NXDOMAIN) [root@nestor:~] # host susebox Host susebox not found: 3(NXDOMAIN) [root@nestor:~] # host hp-officejet hp-officejet has address 192.168.2.252 [root@nestor:~] # host nas nas has address 192.168.2.253 Of course I could add all these hosts to /etc/hosts, but as far as I understand, this *should* work with the hosts appearing only in /etc/dnsmasq.conf. Or have I overlooked something ? Any suggestions ? Cheers & happy new year, Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Site : https://www.microlinux.fr Blog : https://blog.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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