Discuss July 2016

discuss@lists.centos.org

91 participants
78 discussions

SSD for Centos SWAP /tmp & /var/ partition
by Keith Roberts 03 Sep '25

03 Sep '25

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So I had to install another (WD) drive, and repartion it and rebuild my RPM package database, from the backed-up Packages file. That seems to be all OK now. I'm wondering if it would be a good idea to use a new SSD for moving all the disk i/o to, that Linux likes to do so often. Plus putting SWAP onto a decent SSD should speed things up somewhat. Here's a short video of a laptop fitted with a SSD drive booting macOS, compared to a similar laptop booting from the standard HDD. The laptop with the SSD boots and loads some apps in 28 seconds. The other one takes twice as long. http://eshop.macsales.com/shop/SSD/OWC/Mercury_Extreme_Pro_6G/?utm_source=t… Kind Regards, Keith Roberts ----------------------------------------------------------------- Websites: http://www.karsites.net http://www.php-debuggers.net http://www.raised-from-the-dead.org.uk All email addresses are challenge-response protected with TMDA [http://tmda.net] -----------------------------------------------------------------

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I want to connect to a l2tp server from centos.
by Eliezer Croitoru 22 Mar '17

22 Mar '17

I have a server currently connecting to a pptp remote server. This server(lns\lac) has the option for pptp connections and l2tp connections. The l2tp connections are not using ipsec encryption at all. I have seen couple guides\tutorials on the internet: - https://raymii.org/s/tutorials/IPSEC_L2TP_vpn_on_CentOS_-_Red_Hat_Enterpris… - https://wiki.archlinux.org/index.php/L2TP/IPsec_VPN_client_setup But all the guides that I have found are using ipsec with "secret". On ubuntu there is a gui applet that helps setting these kind of connections up but I am working with a CentOS server and not Ubuntu desktop. If someone used l2tp the same way I want to use on CentOS 7 please give me some advice. If you have a guide which might help me I will be more then happy to see this one. Thanks, Eliezer

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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

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CentOS-7-x86_64-GenericCloud.raw very unusual format
by Aliaksei Sheshka 15 Oct '16

15 Oct '16

Hello! Is anyone aware why CentOS-7-x86_64-GenericCloud.raw has such unusual format ? root@test-srv:~# wget http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.raw --2016-03-21 13:16:31-- http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.raw Resolving cloud.centos.org (cloud.centos.org) 162.252.80.138 Connecting to cloud.centos.org (cloud.centos.org)|162.252.80.138|:80... connected. HTTP request sent, awaiting response... 200 OK Length: 374668382 (357M) [application/x-gzip] Saving to: 'CentOS-7-x86_64-GenericCloud.raw' CentOS-7-x86_64-GenericCloud.raw 100%[=========================================================================>] 357.31M 12.9MB/s in 30s 2016-03-21 13:17:03 (11.9 MB/s) - 'CentOS-7-x86_64-GenericCloud.raw' saved [374668382/374668382] Download reports [application/x-gzip] for raw file And indeed root@test-srv:~# file CentOS-7-x86_64-GenericCloud.raw CentOS-7-x86_64-GenericCloud.raw: gzip compressed data, last modified: Sat Feb 27 02:14:37 2016, from Unix Ok, lets uncompress: root@test-srv:~# zcat -d CentOS-7-x86_64-GenericCloud.raw > CentOS-7-x86_64-GenericCloud.a And check again root@test-srv:~# file CentOS-7-x86_64-GenericCloud.a CentOS-7-x86_64-GenericCloud.a: POSIX tar archive (GNU) Ok. it's a tar archive. root@test-srv:~# tar -xf CentOS-7-x86_64-GenericCloud.a -v CentOS-7-x86_64-GenericCloud-1602.raw Now it's CentOS-7-x86_64-GenericCloud-1602.raw file which is indeed raw What is the point to pack single raw file into the tar.gz and to name it raw ? Or it's just a mistake ? Thanks!

8 16

KDE 4.14.8 -- 'Leave' - no suspend to disk
by geo.inbox.ignored 26 Aug '16

26 Aug '16

greetings one and all. just what is a better way to suspend kde on a laptop? for a programmer to write 'leave' routines and not have option to 'suspend to disk', tells me the programmer; does not own a laptop is mad at laptop owners because he does not have one has stock in companies that make batteries for laptops to be serious about this, just where should i post/write to get in contact with someone who can see about getting this problem corrected? any/all suggestions/answers greatly needed. tia. -- peace out. CentOS GNU/Linux 7.1511 tc,hago. g . =+= Tired of having your microsoft os hacked? Change to Linux os, used by microsoft hackers. =+= in a world with out fences, who needs gates. =+=

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users unable to log into kde after 6.8 update
by geo.inbox.ignore 26 Aug '16

26 Aug '16

greetings to all. centos = 6.8 current system = toshiba l455d-s5976 laptop a new problem has developed after 1st updating of 6.8. regular user is not able to open kde desktop, can open gnome desktop. root user can open either kde or gnome desktop. as a user, when i try to open kde, after entering password, screen goes to a solid blue, then shows a quick full screen view of command line text, too quick to read, then screen changes back to login prompt. logged in as root, i created a second user, still have same results as above. searching thru 2+ years of local archives revealed nothing, nor does web searching. any advise, recommendation, suggestion appreciated. tia. -- peace out. -+- Tired of having your microsoft os hacked? Change to Linux os, used by microsoft hackers. -+- in a world with out fences, who needs gates. -+- CentOS GNU/Linux 6.8 tc,hago. g .

4 6

[OT] disk utility showing message "the partition is misaligned by"
by g 26 Aug '16

26 Aug '16

greetings. centos 6.7 [current] 'disk utility' has started showing message; WARNING: The partition is misaligned by 2560 bytes. This may result in very poor performance. Repartitioning is suggested. for sdc5 - /home partition. /dev/sdc5 302243312 156348604 130534968 55% /home /dev/sdc7 80854912 57088 76683952 1% /hdd/c/07 other than time involved to backup sdc5, repartition is not a problem. to my thinking, but not recalling, with fsck; fsck -rN -t ext4 /dev/sdc5 * to check repairs fsck -r -t ext4 /dev/sdc5 * to repair gparted was used to partition drive. is pmagic live a better choice, or should i return fdisk because; =+=+= $ sudo fdisk -l /dev/sdc [sudo] password for geo: Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x0009ede7 Device Boot Start End Blocks Id System /dev/sdc1 * 1 103 819200 83 Linux Partition 1 does not end on cylinder boundary. /dev/sdc2 103 230 1024000 82 Linux swap / Solaris Partition 2 does not end on cylinder boundary. /dev/sdc3 230 2107 15073280 83 Linux /dev/sdc4 2107 121602 959844352 5 Extended /dev/sdc5 2108 42019 320587970+ 83 Linux Partition 5 does not start on physical sector boundary. =+=+= suggestions for correcting above boundaries also appreciated. help needed and greatly appreciated. -- peace out. If Bill Gates got a dime for every time Windows crashes... ...oh, wait. He does. THAT explains it! -+- in a world with out fences, who needs gates. CentOS GNU/Linux 6.7 tc,hago. g .

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Broadcom BCM4313 support broken with kernel 2.6.32-573.7.1.el6.centos.plus.x86_64?
by wwp 24 Aug '16

24 Aug '16

Hello, I noticed that with latest kernel (2.6.32-573.7.1.el6.centos.plus.x86_64), my laptop's Wifi doesn't work, whereas with previous kernel (2.6.32-504.30.3.el6.centos.plus.x86_64), it works fine. Is this a known issue or did I miss something new? BTW, `lspci` says: Broadcom Corporation BCM4313 802.11bgn Wireless Network Adapter (rev 01) Regards, -- wwp

2 2

CentOS 7: System log has repeated lines: Started session 123 of user root.
by therbur 11 Aug '16

11 Aug '16

The system log (/var/log/messages) of a CentOS 7.2 system has frequently-repeated message line pairs like: Jul 18 14:00:01 localhost systemd: Started Session 307 of user root. Jul 18 14:00:01 localhost systemd: Starting Session 307 of user root. where the session number increases each time. Looking around on this, e.g. Red Hat Bugzilla bug 727315, it looks like it's when crond starts a task; it looks like it might be fixed - I would think that would be in CentOS but don't know how to find/compare the Fedora and CentOS systemd versions to know for sure. I found a post on a workaround - in /etc/systemd/system.conf to change the line: #LogLevel=info to: LogLevel=notice I did that and rebooted, and it has stopped the messages. I'm worried though that this may have knocked out something of actual interest from the syslog. So my question is, is there a better way? A way that info messages could go to some other log, or better yet, a way that those particular "session" messages, and only those, could go to some other log or be filtered out?

1 2

LSI SATA MegaRaid & Centos 7 build 1511
by Fawzy Ibrhim 09 Aug '16

09 Aug '16

Dear All; I want to install Centos 7 latest build on NEC Server 5800/120b-2. The installation wizard fails to detect the storage connected to LSI SATA MegaRaid PCI. Centos 5/6 were working fine with this H/W configuration but not the case with Centos 7. Please; advise. Fawzy Ibrahim Redhat Certified Engineer

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Discuss July 2016