f you login to server and after running dmesg – show kernel log command you get tons of messages like:
June 13th, 2014 | Category: Linux | Leave a comment
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Mount point suddenly turned into READ ONLY A RAC system, the GRID mount point on eighth node suddenly turned into read-only mode: [oracle@node8 ~]$ cd /prod/grid [oracle@node8 grid]$ touch 1 touch: cannot touch `1′: Read-only file system Instance is down due to that. We can see below error in OS log: Sep 5 03:26:13 node8 […] Tutorial: e2label, fdisk, /etc/fstab, mount, linux rescue, rescue disk, CentOS Let’s run through an example of a fresh disk, that needs to be configured, going through partitioning with fdisk, make filesystem, filesystem labelled using e2label, /etc/fstab edited, and mounted using mount. This is relevent for CentOS 3.x, 4.x 5.x; YMMV for other flavours. First, […] windows environment. Its exactly the same as tcpdump for linux. http://www.winpcap.org/windump/ However to get this working you will need WinPcap http://www.winpcap.org/default.htm Once installed this is a great tool to watch network traffic. You can specify IP addresses, subnets, ports, interfaces and combinations of. I provide a few examples, but the documentation is great. And as […] In Windows cases you need to merge these files into a PFX file. Now before I tell you the secret I wish to explain what the difference is between the different files so you know how the certificate works. •A .csr file is a certificate signing request which initiates your certificate request with a certificate […] Centos and Rhel 6.5 Hadoop 2.4 3 Node Server hadoop word has been popular for many years, the mention of big data will think hadoop, hadoop then what role is it? Official definition: hadoop is a developing and running large-scale data processing software platform. Core Words is a platform, which means we have a […] When you need to have proxy connection available to whole system, so dont bother with settings for firefox, yum proxy and similar, its simple as just plain file 😉 just copy & paste following code to terminal window. if you need other shell , like csh , just add another file with csh extension. This […] in /etc/sysctl.conf : net.ipv6.conf.all.disable_ipv6 = 1 in /etc/sysconfig/network : NETWORKING_IPV6=no in /etc/sysconfig/network-scripts/ifcfg-eth0 : IPV6INIT=”no” disable iptables6 – chkconfig –level 345 ip6tables off reboot In /etc/grub.conf edit the kernel lines to include: 1 ipv6.disable=1 The “trick” here, as described by TrevorH1 in #linux, is that programs can still load the module as they wish. You can […] Commands CUT: lspv | cut -c 6-7 lists the hdisks numbers (cuts the 6th and 7tn character (disk nubers)) dlnkmgr view -drv | grep -w 00000 | awk ‘{print $4}’ | cut -d . -f 3 ——————————————————————————– EXPR: integer arithmetic \* multiplication (\ is needed to tell * is not a special character) / division […] Resource limits is the concept where you regulate several resources consumed by a process on an UNIX operating systems. Although the resource limits are set on a per user basis, they are applied per process basis. Therefore, if a user is executing hundreds of processes, the user may consume huge amount of resources, even if […] |
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