Category: Uncategorized

Kernel: e1000e 0000:02:00.0: eth0: Error reading PHY register

Posted on by David Saliba

In recent CentOS version 6.3 is an unresolved bug, which causes the network card to freeze the server.

Following message appears in /var/log/messages

kernel

To work around the problem you will need to turn off Active-State Power Management (ASPM)
(Feature that saves power in the Peripheral Component Interconnect Express (PCI Express or PCIe) subsystem by setting a lower power state for PCIe links when the devices to which they connect are not in use)

For GRUB bootloader edit the following file: /boot/grub/grub.conf and append pcie_aspm=off to the end of kernel boot line.

For example:

kernel /vmlinuz-2.6.32-279.el6.x86_64 ro root=UUID=81e9e0a2-0a51-4d75-955d-909aaf848192 rd_NO_LUKS  KEYBOARDTYPE=pc KEYTABLE=us LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 crashkernel=auto rd_NO_DM rd_MD_UUID=c6855f45:016a63bb:2d79bfb2:07371ed8 rd_NO_LVM rd_MD_UUID=5d5a434e:6c20cfcd:51340c3f:29c29151 pcie_aspm=off

To verify the change, reboot the server and run the following command:

dmesg | grep PCIe
PCIe ASPM is disabled

If your output is different, the change in grub.conf did not take an effect.

Set timezone Centos

Posted on by David Saliba

vim /etc/sysconfig/clock

ZONE=”Europe/London”

 

ln -sf /usr/share/zoneinfo/Europe/London /etc/localtime

done..

nJoy 😉

 

Sending Elasticsearch to a syslog server

Posted on by David Saliba

yum install rsyslog -y

Add the following to rsyslog.conf on the client system

############

$ModLoad imfile
$InputFileName /var/log/elasticsearch/elasticsearch.log
$InputFileTag elasticsearch
$InputFileStateFile stat-elasticsearch
$InputFileSeverity Info
$InputFileFacility daemon
$InputRunFileMonitor
#local3.* hostname:<portnumber>

daemon.* @192.168.1.66:514


############

 

Also if you want all logs to go through to syslog server:

 

*.* @192.168.1.66

 

at the end of the file.

Issue a :

service rsyslog restart

and watch the logs flow in.

 

nJoy 😉

 

 

 

 

Installing sample data in elastic search

Posted on by David Saliba

After installing elastic search it is useful for testing and training to load some sample data.

1) create mapping :

curl -XPUT http://localhost:9200/shakespeare -d '
{
 "mappings" : {
  "_default_" : {
   "properties" : {
    "speaker" : {"type": "string", "index" : "not_analyzed" },
    "play_name" : {"type": "string", "index" : "not_analyzed" },
    "line_id" : { "type" : "integer" },
    "speech_number" : { "type" : "integer" }
   }
  }
 }
}
';

2) Load the data using the bulk api:

wget "https://github.com/ropensci/elastic_data/blob/master/data/shakespeare_data.json?raw=true" -O  shakespeare.json

curl -XPUT localhost:9200/_bulk --data-binary @shakespeare.json

 

nJoy 😉

 

 

 

Preferred Tools on Linux

Posted on by David Saliba

Might need Epel or other repo

For CentOS 6 :

yum install epel-release -y
yum install net-tools man screen htop vim-enhanced wget iotop iftop sysstat usbutils nfs-utils bind-utils ntp tcpdump telnet tree mlocate zip unzip pciutils git -y

For Ubuntu

 apt-get install -y glances language-pack-en net-tools man screen htop vim wget iotop iftop sysstat usbutils  ntp tcpdump telnet tree mlocate zip unzip pciutils git npm sysv-rc-conf

nJoy 😉

To cleanup a brick previously used under glusterfs

Posted on by David Saliba

This must be done after you REALLY know this brick is going to be re-used elsewhere not in the same volume it was used before.
NOTE: Potential data loss 

setfattr -x trusted.glusterfs.volume-id $brick_path
setfattr -x trusted.gfid $brick_path
rm -rf $brick_path/.glusterfs