Discuss March 2017

discuss@lists.centos.org

125 participants
111 discussions

RHEL 6.9 is out
by Phelps, Matthew 28 Mar '17

28 Mar '17

Red Hat released RHEL 6.9 yesterday. Why isn't CentOS 6.9 out yet? :) -- Matt Phelps System Administrator, Computation Facility Harvard - Smithsonian Center for Astrophysics mphelps(a)cfa.harvard.edu, http://www.cfa.harvard.edu

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mirror for debug_info repo
by jsl6uy js16uy 28 Mar '17

28 Mar '17

Hello all hope all is well. We pull down via rsync from a Centos mirror for general updates/os/etc. I don't see a mirror for debuginfo.centos.org::centos-debuginfo well debuginfo.centos.org. The banner for the site states you should only use this site if you plan to be a public mirror. I have not checked every site on the centos mirror list, checked 10 to 15 in the US, but the only one I found that even had a folder for a debug_info sync stated: "due to size this has been moved to debuginfo.centos.org" I am only syncing debuginfo.centos.org::centos-debuginfo/7/x86_64 and i386. Should I pull from here? Is there a better place? Just trying to do the right thing net/netizen resource usage wise Any help/guidance appreciated thanks all

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Re: [CentOS] firewalld management on a headless server
by m.roth＠5-cent.us 28 Mar '17

28 Mar '17

James B. Byrne wrote: > > On Mon, March 27, 2017 17:31, m.roth(a)5-cent.us wrote: >> Mike wrote: >>> Nice catch, Mr. Schumacher ---> The following modules are included as standard with release 1.831 of Webmin. FirewallD firewalld.wbm.gz Configure a Linux firewall using FirewallD, by editing allowed services and ports. >>> >>> This is likely the right tool for the job. >>> >> Webmin used to be considered insecure, and people would scream and yell if you suggested using it. Has that changed? > > Webmin is as insecure as the administrator cares to make it. > > Our host systems' Webmin instances listen on a reserved IP address different from the host's DNS entry and that address is only reachable through the host's firewall from specified IP addresses originating on our internal LAN. Further, Webmin is configured to automatically switch to https and use a certificate generated by our corporate private CA. Our gateway firewall blocks all access to the port > assigned to Webmin. One has to tunnel in to one of the pre-determined host addresses to obtain remote access. > > A separate webmin logon is set in the webmin configuration which has no existence on the host system. > > Webmin can also be configured to restrict the hours and day that asccess is allowed to specific users but we have not bothered with that. > > The main known weakness is Webmin's dependency on passwords which for all I know is due to my ignorance. If Webmin does support RSA > certificate authentication then I would love to be told where it is configured. However,failing that, very long phase phrases mitigate the password issue somewhat. Further, Webmin does support two-factor authentication using Google or Authy. > > To my knowledge there are no CVEs reported for Webmin since 2015 and I believe that all known problems are resolved in the present release. Which is not to say that there are no exploits left to be uncovered but then again we can hardly claim that about any software. > Thanks for the extended response, James, esp. that last paragraph. I hadn't been following webmin for a number of years - we don't use it here. I did find and use it in a job I was in ten years ago - it was the only way I could get LDAP working, as, at the time, the tools that came with the package were *not* ready for prime time.... mark PS: Tried reply, James, but it bounced.

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Using i3 wm under CentOS7
by C. L. Martinez 28 Mar '17

28 Mar '17

Hi all, Anyone has installed i3 wm under CentOS7? Any samples? I have some doubts about to how to manage battery power, notifications, etc. Thanks -- Greetings, C. L. Martinez

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Re: [CentOS] firewalld management on a headless server
by James B. Byrne 28 Mar '17

28 Mar '17

On Mon, March 27, 2017 17:31, m.roth(a)5-cent.us wrote: > Mike wrote: >> Nice catch, Mr. Schumacher ---> The following modules are included >> as >> standard with release 1.831 of Webmin. FirewallD firewalld.wbm.gz >> Configure a Linux firewall using FirewallD, by editing allowed >> services and ports. >> >> This is likely the right tool for the job. >> > Webmin used to be considered insecure, and people would scream and > yell if you suggested using it. Has that changed? Webmin is as insecure as the administrator cares to make it. Our host systems' Webmin instances listen on a reserved IP address different from the host's DNS entry and that address is only reachable through the host's firewall from specified IP addresses originating on our internal LAN. Further, Webmin is configured to automatically switch to https and use a certificate generated by our corporate private CA. Our gateway firewall blocks all access to the port assigned to Webmin. One has to tunnel in to one of the pre-determined host addresses to obtain remote access. A separate webmin logon is set in the webmin configuration which has no existence on the host system. Webmin can also be configured to restrict the hours and day that asccess is allowed to specific users but we have not bothered with that. The main known weakness is Webmin's dependency on passwords which for all I know is due to my ignorance. If Webmin does support RSA certificate authentication then I would love to be told where it is configured. However,failing that, very long phase phrases mitigate the password issue somewhat. Further, Webmin does support two-factor authentication using Google or Authy. To my knowledge there are no CVEs reported for Webmin since 2015 and I believe that all known problems are resolved in the present release. Which is not to say that there are no exploits left to be uncovered but then again we can hardly claim that about any software. -- *** e-Mail is NOT a SECURE channel *** Do NOT transmit sensitive data via e-Mail Do NOT open attachments nor follow links sent by e-Mail James B. Byrne mailto:ByrneJB@Harte-Lyne.ca Harte & Lyne Limited http://www.harte-lyne.ca 9 Brockley Drive vox: +1 905 561 1241 Hamilton, Ontario fax: +1 905 561 0757 Canada L8E 3C3

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Re: [CentOS] firewalld management on a headless server
by Mike 28 Mar '17

28 Mar '17

Webmin used to be considered insecure, and people would scream and yell if you suggested using it. Has that changed? mark Ahh, I did not know of this. Well, I'm back to suggesting OP take a little time and get comfortable with firewall-cmd in the terminal. If we want our solid redhat clone then systemd, NetworkManager, and firewalld are soldered into the foreseeable future.

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Does fail2ban protect anything other than SSH logins?
by Robert Moskowitz 27 Mar '17

27 Mar '17

I am looking at fail2ban, and all I see is it protecting remote logins to SSH. Does it protect any other access to systems? Well perhaps other than VNC perhaps? thank you

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Systemd interface rename does not work
by Matt . 27 Mar '17

27 Mar '17

Hi, I'm moving to Systemd for my network management but I don't see my link name changed when I try to using a .link name. The .network file works right, networkmanager is removed as well to accomplish this. Any idea why the rename is not done ? /etc/systemd/network/0-eth.network [Match] MACAddress=00:1a:4a:a9:0a:17 [Network] Address=172.16.3.141/24 Gateway=172.16.3.254 DNS=172.16.3.1 DNS=172.16.3.2 /etc/systemd/network/0-eth.link [Match] MACAddress=00:1a:4a:a9:0a:17 [Link] Name=eth0

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SNMP oddity
by Digimer 25 Mar '17

25 Mar '17

Hi all, Not sure if this is on topic or not. I'm trying to query an SNMP value from centos 6 and I get a bad response if I don't specify the MIB to use: 0 digimer@pulsar:~/anvil/striker$ snmpget -v2c -c public -m /home/digimer/Downloads/APC/AP7900/MIB/powernet421.mib 10.255.2.1 .1.3.6.1.2.1.2.2.1.6.2 RFC1213-MIB::ifPhysAddress.2 = Hex-STRING: 00 C0 B7 5F 8A 85 0 digimer@pulsar:~/anvil/striker$ snmpget -v2c -c public 10.255.2.1 .1.3.6.1.2.1.2.2.1.6.2 IF-MIB::ifPhysAddress.2 = STRING: 0:c0:b7:5f:8a:85 Note the second reply is not returning the first character (should be '00:', returning '0:'. Trying to request Hex doesn't seem to help, either: 0 digimer@pulsar:~/anvil/striker$ snmpget -v2c -c public -Ox 10.255.2.1 .1.3.6.1.2.1.2.2.1.6.2 IF-MIB::ifPhysAddress.2 = STRING: 0:c0:b7:5f:8a:85 Any SNMP folks know what I might be doing wrong? Thanks! -- Digimer Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops." - Stephen Jay Gould

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Disabling Firewall/iptables on CentOS 7??
by James Pifer 24 Mar '17

24 Mar '17

I apologize if this has been asked and answered, but I googled and attempted things for several hours today without success. I have a freshly installed CentOS 7 system that I'd like to disable the firewall and all iptables rules. Basically the equivalent of doing iptables -F In a nutshell I've tried the following commands, in many different ways and orders, but when the system restarts it still seems to end up with some form of default rules. It even has a couple rules specifying 192.168.122.0 and I can't figure out where it's coming from. #Disable Firewall systemctl stop firewalld systemctl disable firewalld rm '/etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service' rm '/etc/systemd/system/basic.target.wants/firewalld.service' systemctl disable firewalld systemctl stop firewalld iptables --flush iptables --list iptables -L yum install iptables-services service iptables save systemctl enable iptables service iptables save Any help is appreciated. Thanks James

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Discuss March 2017