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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

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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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C6: latest util-linux-ng dependency on kernel?
by tony＠softins.co.uk 23 Nov '16

23 Nov '16

I am just applying the latest C6 updates to a couple of KVM Linodes. It appears that the latest update of util-linux-ng has added a new dependency on the kernel package. On these VMs, the kernel package is not normally installed, and the VM runs a host-supplied kernel. But now, a "yum update" wants to install for dependencies kernel, kernel-firmware and grubby, none of which should be necessary in this environment. I have allowed it on one Linode and rebooted it. All seems ok and it is still running the host-supplied kernel, but it still grates that an unused kernel should have been required to be installed. Is this an error in util-linux-ng, or a real new requirement? Cheers Tony -- Tony Mountifield Work: tony(a)softins.co.uk - http://www.softins.co.uk Play: tony(a)mountifield.org - http://tony.mountifield.org

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Re: [CentOS] New laptop recomendation
by Darr Darr 22 Nov '16

22 Nov '16

> Alternatively Precision Workstations would do. If that's the route you go, on outlet.dell.com you can filter for just those by choosing Outlet for Work (if you watch the banners at the top you can often squeeze an additional 20%-30% off the already discounted - from the 'build your own' - prices... enough to pay for 3 or 4 year Pro Support Plus coverage, which provides next-day repair service... the 'plus' includes even accidental damage). Be aware though, their Thunderbolt 3 ports might not yet be supported by even C7 unless you're willing to compile new kernels yourself with the proper options enabled (sorry - not sure exactly which options are required). A query about Thunderbolt 3 support in C6 at centos.org/forums/viewtopic.php?f=13&t=57927 asked back in May has yet to attract a response. Sent from my Samsung Galaxy S5

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CentOS 6, Apache 2.2.15 and SNI?
by Walter H. 21 Nov '16

21 Nov '16

Hello, is Apache 2.2 which is part of the CentOS distribution capable of SNI? I have troubles that are coming from server side (CentOS 6.8, Apache 2.2.15) just did 'yum update' in /etc/httpd/conf/httpd.conf I've the following NameVirtualHost ipaddr:443 Include /etc/httpd/conf/vhosts/vhost-ssldom1-box.conf Include /etc/httpd/conf/vhosts/vhost-ssldom2-box.conf both 'vhost'-files are like this: <VirtualHost ipaddr:443> ServerAdmin webmaster(a)domain#.com ServerName vhost.domain#.com:443 ServerAlias box.domain#.com:443 ServerAlias calcbox.domain#.com:443 ServerAlias proxybox.domain#.com:443 ... SSLEngine on SSLStrictSNIVHostCheck on SSLCertificateFile /etc/httpd/conf/ssl.crt/domain#-host.crt SSLCertificateKeyFile /etc/httpd/conf/ssl.key/domain#-host.key SSLCertificateChainFile /etc/httpd/conf/ssl.crt/server-chain.crt ... </VirtualHost> only https://domain1.com/... works https://domain2.com/... results in a certificate CN mismatch ... what is missing in my config.? Thanks, Walter

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