Discuss November 2016

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125 participants
98 discussions

Power Cut
by Hadi Motamedi 02 Nov '16

02 Nov '16

Dear All I am using a centos server for cdr billing and mediation device on a remote network. I am experiencing problem that I am suspicious it comes from main supply power cut at the remote site. The power supply to the remote site comes from battery charger that will be automatically switched in circuit under main supply power cut but cannot provide adequate power for more than 2 hours . I am suspicious that the remote system is suffering from many frequent main supply power cut . Can you please do me favor and let me know if there is any log on my centos server that I can check to see if there would be many frequent power cut there ? Thank you for your time

9 15

NetworkManager icon not showing
by Nicolas Kovacs 02 Nov '16

02 Nov '16

Hi, I just installed CentOS 7 on my Asus S300 laptop. Wireless was working OK at first, but now for mysterious reasons the NetworkManager icon seems to have disappeared from the notification area. When I click on that area, there's only information showing about sound, brightness, battery status and the connected user. Which leaves me clueless. Any suggestions? Niki Kovacs -- 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

1 1

CVE-2016-5195 DirtyCOW: Critical Linux Kernel Flaw
by Valeri Galtsev 02 Nov '16

02 Nov '16

Dear All, I guess, we all have to urgently apply workaround, following, say, this: https://gryzli.info/2016/10/21/protect-cve-2016-5195-dirtycow-centos-7rhel7… At least those of us who still have important multi user machines running Linux. (Yes, me too, I do have a couple, thank goodness, the rest are already not ;-) Have a productive weekend, everybody. Valeri ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++

18 33

How to block routing/forwarding with firewalld
by Jeff White 02 Nov '16

02 Nov '16

On CentOS 7 with firewalld I have a box with numerous interfaces acting as a NAT gateway. This works but I noticed that it routes/forwards traffic not just from my internal zone to external zone but also between interfaces within the internal zone. How can I prevent that traffic? I've tried adding direct and rich rules to deny the traffic but it doesn't work. Direct: firewall-cmd --direct --add-rule ipv4 filter INPUT 0 -s 10.110.4.0/22 -d 10.110.0.0/22 -j REJECT That command works, and I see it in `iptables -L` but traffic is still allowed. Rich: # firewall-cmd --zone=trusted --add-rich-rule='rule family=ipv4 source address=10.110.4.0/22 destination address=10.110.0.0/22 reject' Error: INVALID_RULE: destination action I can't find any explanation of what that error means. So, how do you tell firewalld to stop forwarding traffic between interfaces? # firewall-cmd --get-active-zones public interfaces: ens161 ens193 trusted interfaces: ens192 ens224 ens256 lo # firewall-cmd --list-all public (default, active) interfaces: ens161 ens193 sources: services: dhcpv6-client ssh ports: masquerade: yes forward-ports: icmp-blocks: rich rules: -- Jeff White HPC Systems Engineer Information Technology Services - WSU

3 2

Latest glusterfs 3.8.5 server not compatible with livbirt libgfapi access
by Radu Radutiu 02 Nov '16

02 Nov '16

Hi, After updating glusterfs server to 3.8.5 (from Centos-gluster-3.8.repo) the KVM virtual machines (qemu-kvm-ev-2.3.0-31) that access storage using libgfapi are no longer able to start. The libvirt log file shows: [2016-11-02 14:26:41.864024] I [MSGID: 104045] [glfs-master.c:91:notify] 0-gfapi: New graph 73332d32-3937-3130-2d32-3031362d3131 (0) coming up [2016-11-02 14:26:41.864075] I [MSGID: 114020] [client.c:2356:notify] 0-testvol-client-0: parent translators are ready, attempting connect on transport [2016-11-02 14:26:41.882975] I [rpc-clnt.c:1947:rpc_clnt_reconfig] 0-testvol-client-0: changing port to 49152 (from 0) [2016-11-02 14:26:41.889362] I [MSGID: 114057] [client-handshake.c:1446:select_server_supported_programs] 0-testvol-client-0: Using Program GlusterFS 3.3, Num (1298437), Version (330) [2016-11-02 14:26:41.890001] I [MSGID: 114046] [client-handshake.c:1222:client_setvolume_cbk] 0-testvol-client-0: Connected to testvol-client-0, attached to remote volume '/data/brick1/testvol'. [2016-11-02 14:26:41.890035] I [MSGID: 114047] [client-handshake.c:1233:client_setvolume_cbk] 0-testvol-client-0: Server and Client lk-version numbers are not same, reopening the fds [2016-11-02 14:26:41.917990] I [MSGID: 114035] [client-handshake.c:201:client_set_lk_version_cbk] 0-testvol-client-0: Server lk version = 1 [2016-11-02 14:26:41.919289] I [MSGID: 104041] [glfs-resolve.c:885:__glfs_active_subvol] 0-testvol: switched to graph 73332d32-3937-3130-2d32-3031362d3131 (0) [2016-11-02 14:26:41.922174] I [MSGID: 114021] [client.c:2365:notify] 0-testvol-client-0: current graph is no longer active, destroying rpc_client [2016-11-02 14:26:41.922269] I [MSGID: 114018] [client.c:2280:client_rpc_notify] 0-testvol-client-0: disconnected from testvol-client-0. Client process will keep trying to connect to glusterd until brick's port is available [2016-11-02 14:26:41.922592] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-gfapi: size=84 max=1 total=1 [2016-11-02 14:26:41.923044] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-gfapi: size=188 max=2 total=2 [2016-11-02 14:26:41.923419] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-gfapi: size=140 max=2 total=2 [2016-11-02 14:26:41.923442] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-client-0: size=1324 max=2 total=5 [2016-11-02 14:26:41.923458] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-dht: size=1148 max=0 total=0 [2016-11-02 14:26:41.923546] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-dht: size=3380 max=2 total=5 [2016-11-02 14:26:41.923815] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-read-ahead: size=188 max=0 total=0 [2016-11-02 14:26:41.923832] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-readdir-ahead: size=60 max=0 total=0 [2016-11-02 14:26:41.923844] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-io-cache: size=68 max=0 total=0 [2016-11-02 14:26:41.923856] I [MSGID: 101053] [mem-pool.c:617:mem_pool_destroy] 0-testvol-io-cache: size=252 max=1 total=3 [2016-11-02 14:26:41.923877] I [io-stats.c:3747:fini] 0-testvol: io-stats translator unloaded [2016-11-02 14:26:41.924191] I [MSGID: 101191] [event-epoll.c:659:event_dispatch_epoll_worker] 0-epoll: Exited thread with index 2 [2016-11-02 14:26:41.924232] I [MSGID: 101191] [event-epoll.c:659:event_dispatch_epoll_worker] 0-epoll: Exited thread with index 1 2016-11-02T14:26:42.825041Z qemu-kvm: -drive file=gluster://s3/testvol/c7.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none: Could not read L1 table: Bad file descriptor The brick is available , runs on the same host and mounted in another directory using fuse (to confirm that it is indeed fine). If I downgrade the gluster server to 3.8.4 everything works fine. Anyone has seen this or has any idea how to debug? Regards, Radu

1 0

how to view a picture under shell?
by Glenn WANG 02 Nov '16

02 Nov '16

hi, all, is there any command(such asciiview) to view the picture under bash shell? I found the asciiview could meet my requirement, but how to install it on centos? thanks.

2 2

Download Centos 7.2 64 bit
by JEYARAJ 02 Nov '16

02 Nov '16

Hi All, How to download the Centos 7.2 64 bit.. If you see anyone please send me the link. Urgent. Regards, Jeyaraj. M

3 3

how to install amule in CertOS 7?
by Zhao Xiaoqi 01 Nov '16

01 Nov '16

I could find the amule package in CertOS7, is anyone know this? Thanks. Xiaoqi

1 0

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Discuss November 2016