Discuss November 2016

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125 participants
98 discussions

Off-Topic: Travel Router and Firewall
by H 26 Nov '16

26 Nov '16

This is off-topic and the only connection with CentOS is that the laptop will be running CentOS... I am looking for a travel router/firewall for a number of reasons: - Protect against outside attacks when outside the office/home not relying on whatever protection the laptop/tablet/phone offers. - Allow for fast transfer for data between devices without being limited by the bandwidth of the hotel etc., even without being connected to the internet. - Allow for multiple devices even when the hotel etc. only allows one device to be registered. The ideal device should: - Be small, ideally be able to be charged via a USB port. - Use open-source software that the user can update. - Allow the user to log on the device and set up the connection with the hotel etc. which often requires a userid and password to be entered on a browser page. - Allow using either a RJ-45 wired or wireless connection to the outside net. - Have at least two RJ-45 ports to connect a laptop avoiding WiFi. - Allow for VPN tunneling. If anyone has suggestions, they would be greatly appreciated!

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Thruk reports /var/tmp/live.sock: No such file or directory inspite of the file being present
by Kaushal Shriyan 26 Nov '16

26 Nov '16

Hi, I am running thruk (version is thruk-2.12-1.x86_64) which is a web interface for nagios 4.2.3 and running httpd-2.4.6-40.el7.centos.4.x86_64 on CentOS Linux release 7.2.1511 (Core) While accessing thruk web interface http://thruk.mydomain.com/thruk/cgi-bin/ status.cgi?host=all&_=1480078344275 I am seeing this issue in *thruk.log prod: ERROR: failed to open socket /var/tmp/live.sock: No such file or directory* As you can see the file /var/tmp/live.sock is present as per the below ls -l command output, I am not sure about the above error of No such file or directory #ls -l /var/tmp/live.sock srw-rw---- 1 nagios nagios 0 Nov 25 18:12 /var/tmp/live.sock I can share the /etc/httpd/conf.d/thruk.conf. selinux is disabled. thruk :- https://www.thruk.org/ http://sprunge.us/iPIU is the output of *strace -p pidofthruk* apache 4248 0.0 0.3 106020 31016 ? S 19:25 0:00 /usr/bin/perl /usr/share/thruk/script/thruk_fastcgi.pl Please let me know if you need any additional information. Regards, Kaushal

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linux-3.10.0-514.el7.tar.xz - process of creation
by Staazul 25 Nov '16

25 Nov '16

I try to create own patch for kernel, and I look in process of generation binary rpm file. As I can see, for creation binary package, rpmbuild doesn't uses any set of patches and doesn't uses file of original (vanilla) version of kernel. Instead it, I see some xz archive of compressed tree of kernel probably with all changes (linux-3.10.0-514.el7.tar.xz). How and where I can find process of creation of this archive and to see separately all set of patches? I want to remove some changes and add own. Many thanks to all, who have such info and can give link on process or link on documentations of process of creation of this archive. best regards, Andrei upwork.link

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Pacemaker bugs?
by Andreas Haumer 25 Nov '16

25 Nov '16

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi! I think I stumbled on at least two bugs in the CentOS 7.2 pacemaker package, though I'm not quite sure if or where to report it. I'm using the following package to set up a 2-node active/passive cluster: [root@clnode1 ~]# rpm -q pacemaker pacemaker-1.1.13-10.el7_2.4.x86_64 The installation is up-to-date on both nodes as of the current PIT. I have currently the following cluster resources running: [root@clnode2 ~]# pcs status Cluster name: rucluster1 Last updated: Fri Nov 25 11:26:51 2016 Last change: Fri Nov 25 10:51:32 2016 by root via cibadmin on clnode1 Stack: corosync Current DC: clnode2 (version 1.1.13-10.el7_2.4-44eb2dd) - partition with quorum 2 nodes and 12 resources configured Online: [ clnode1 clnode2 ] Full list of resources: p_ip_cluster (ocf::heartbeat:IPaddr2): Started clnode2 Master/Slave Set: ms_drbd_r0 [p_drbd_r0] Masters: [ clnode2 ] Slaves: [ clnode1 ] p_fs_drbd1 (ocf::heartbeat:Filesystem): Started clnode2 p_apache (ocf::heartbeat:apache): Started clnode2 p_dhcpd (ocf::heartbeat:dhcpd): Started clnode2 p_named (ocf::heartbeat:named): Started clnode2 p_slapd (ocf::heartbeat:slapd): Started clnode2 p_postgres (ocf::heartbeat:pgsql): Started clnode2 p_nmb (systemd:nmb): Started clnode2 p_smb (systemd:smb): Started clnode2 p_winbind (systemd:winbind): Started clnode2 PCSD Status: clnode1: Online clnode2: Online Daemon Status: corosync: active/enabled pacemaker: active/enabled pcsd: active/enabled The first bug is rather serious, though a workaround exists! The cluster works fine, but as soon as I add a cluster resource of class "service", the cluster manager software runs havoc on node failover. In that situation, the lrmd process hangs in an infinite loop (neither strace nor ltrace show any outout so it seems to be an internal loop without any system or library call) and almost any call to the cluster manager software (crmsh or pcs) runs into a timeout. It's quite hard to recover the whole cluster from this situation. When I replace the resource class "service" with resource class "systemd", everything seems to work just fine. I found a rather old, already closed bug for Fedora which looks similar: <https://bugzilla.redhat.com/show_bug.cgi?id=1117151> Another bug seems to be rather minor: I see following assertions in the corosync logs: Nov 25 11:13:56 [3206] clnode1 crmd: error: crm_abort: pcmkRegisterNode: Triggered assert at xml.c:594 : node->type == XML_ELEMENT_NODE They seem to be related with the drbd resource, but do not cause any functional problem it seems. For this particular problem I found the following patch: <https://github.com/ClusterLabs/pacemaker/commit/68c7506aa84c69e5f425ef5f302…> Are these already known bugs? (I searched the CentOS bugzilla site but couldn't find any ticket describing these bugs) Any advise on if or where I should report it? Thanks! - - andreas - -- Andreas Haumer | mailto:andreas@xss.co.at *x Software + Systeme | http://www.xss.co.at/ Karmarschgasse 51/2/20 | Tel: +43-1-6060114-0 A-1100 Vienna, Austria | Fax: +43-1-6060114-71 -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) iD8DBQFYOBLBxJmyeGcXPhERAmSKAJ9NNI+D2OaBR1I8jum6AywMxQxsmACfU71C HV+6j+4YRy71BkjHfipPJFg= =Okfp -----END PGP SIGNATURE-----

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Re: [CentOS] Off-Topic: Travel Router and Firewall
by James B. Byrne 25 Nov '16

25 Nov '16

On Thu, November 24, 2016 12:28, H wrote: > You are right, I had forgotten about needing two WiFi adapters... If > there is an Ethernet jack in the hotel room I would go with that but > that is, of course, far from assured and two WiFi nets would be > needed. I have found Ethernet RJ45 ports in hotel rooms with wi-fi frequently no longer active and simply relics of an earlier Internet service. -- *** 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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Permanent job in Tokyo, Japan
by James Tobin 25 Nov '16

25 Nov '16

Hello, I’m working with an employer that is looking to hire someone to fulfil a permanent DevOps-type position at their office in Tokyo. Japanese language is not required; only English. Consequently I had hoped that some members of this mailing list may like to discuss further; off-list. I can be reached using "JamesBTobin (at) Gmail (dot) Com". Kind regards, James

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Headless Centos 7 "File and Print Server" install - configure WIFI
by Gary Stainburn 24 Nov '16

24 Nov '16

Google has done it's usual job and returned lots of results but not led me to a solution. I've just build a Centos 7 "File and Print Server" config, i.e. no screen/keyboard/mouse and no GUI installed. The LAN connection has worked out of the box and I can SSH into the server without issue. However, I cannot find out how to configure the WIFI connection which I need in order to provide Air Print services. I'm using a USB dongle which the kernel has recognised and provides me with a device. I can use that device to scan for available WIFI networks. What I can't do is configure a connection so that the server can connect to the the WIFI network. Can anyone help with a link to suitable instructions? Cheers Gary [root@zeppo2 ~]# ifconfig enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 10.6.1.191 netmask 255.255.255.0 broadcast 10.6.1.255 inet6 fe80::96de:80ff:fe88:1b8d prefixlen 64 scopeid 0x20<link> ether 94:de:80:88:1b:8d txqueuelen 1000 (Ethernet) RX packets 2726 bytes 230386 (224.9 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 1208 bytes 113637 (110.9 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536 inet 127.0.0.1 netmask 255.0.0.0 inet6 ::1 prefixlen 128 scopeid 0x10<host> loop txqueuelen 0 (Local Loopback) RX packets 12 bytes 1152 (1.1 KiB) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 12 bytes 1152 (1.1 KiB) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 wlp0s26u1u2: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500 ether 00:0f:60:09:2a:65 txqueuelen 1000 (Ethernet) RX packets 0 bytes 0 (0.0 B) RX errors 0 dropped 0 overruns 0 frame 0 TX packets 0 bytes 0 (0.0 B) TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0 [root@zeppo2 ~]# nmcli dev status DEVICE TYPE STATE CONNECTION enp3s0 ethernet connected enp3s0 wlp0s26u1u2 wifi disconnected -- lo loopback unmanaged -- [root@zeppo2 ~]# nmcli dev wifi list * SSID MODE CHAN RATE SIGNAL BARS SECURITY RW-SECURE Infra 9 54 Mbit/s 19 ▂___ WPA1 RW-Guest Infra 9 54 Mbit/s 19 ▂___ -- [root@zeppo2 ~]#

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Re: [CentOS] CentOS 6, Apache 2.2.15 and SNI?
by James B. Byrne 24 Nov '16

24 Nov '16

On Sun, November 20, 2016 12:43, Walter H. wrote: > > https://box.domain1.com works > but > https://box.domain2.com results in 'Certificate name mismatch' > > What are the contents of the certificate(s) you have configured for tls? What AltSubject names, if any, do the certificate(s) support? -- *** 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

2 1

Dnsmasq and /etc/hosts
by Nicolas Kovacs 24 Nov '16

24 Nov '16

Hi, I just setup CentOS 7 on three boxes to fiddle with it. 1. amandine.sandbox.lan is a headless LAN server 2. bernadette.sandbox.lan is a client desktop 3. raymonde.sandbox.lan is another client desktop I've setup Dnsmasq on amandine.sandbox.lan. Here's the very basic configuration: # /etc/dnsmasq.conf domain-needed bogus-priv interface=enp3s1 dhcp-range=192.168.3.100,192.168.3.200,24h local=/sandbox.lan/ domain=sandbox.lan expand-hosts no-resolv # DNS server=192.168.2.1 # Postes fixes dhcp-host=00:1E:C9:43:A7:BF,bernadette,192.168.3.2 dhcp-host=00:1D:09:15:4A:D8,raymonde,192.168.3.3 With this setup as such, I can resolve bernadette from raymonde, and I can also resolve raymonde from bernadette. But when I try to resolve either bernadette or raymonde from the server, I get an unknown hostname. The only way to solve this is to add two corresponding lines to /etc/hosts: # /etc/hosts 127.0.0.1 localhost.localdomain localhost 192.168.3.1 amandine.sandbox.lan amandine 192.168.3.2 bernadette.sandbox.lan bernadette 192.168.3.3 raymonde.sandbox.lan raymonde This strikes me as a benign redundancy, which makes me wonder if I'm doing something unorthodox here. Any suggestions? Niki -- Microlinux - Solutions informatiques durables 7, place de l'église - 30730 Montpezat Web : http://www.microlinux.fr Mail : info(a)microlinux.fr Tél. : 04 66 63 10 32

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Re: [CentOS] New laptop recomendation
by Michael Duvall 23 Nov '16

23 Nov '16

I run Dell M7710 with 32GB, SSDs, and nVidia graphics. It wasn't cheap, but it's blisteringly fast. -- Michael Duvall <michael.duvall(a)ccur.com> Concurrent Computer Corporation

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Discuss November 2016