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Linux Disk Management – Multipath Management

December 16, 2016July 21, 2017 Eli Kleinman Leave a comment

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Contents 1 Cofiguring Multipathing 1.1 Install Multipath Package. 1.2 Enable The Multipathing Service. 1.3 List Multipath Disks 2 Zoning FC On Linux 2.1 Find the WWN for the Ports 2.2 Issuing a LIP on the HBA 2.3 Fibre Channel Commands 3 Disk Configuration. 3.1 About Device Names And Paths In A Multipath Configuration 3.1.1 Physical […]

Linux RAID & LVM

June 9, 2016March 3, 2017 Eli Kleinman Leave a comment

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LVM stuff

pvdisplay

vgdisplay

lvdisplay

pvdisplay

vgdisplay

lvdisplay

Check status

cat /proc/mdstat

cat /etc/mdadm.conf

cat /proc/mdstat

cat /etc/mdadm.conf

Make Raid 10

mdadm --create /dev/md30 --run --level=10 --chunk=4 --raid-devices=4 /dev/sda /dev/sdb /dev/sdd /dev/sdf

mdadm --examine /dev/md30
mdadm --detail /dev/md30

mdadm --create /dev/md30 --run --level=10 --chunk=4 --raid-devices=4 /dev/sda /dev/sdb /dev/sdd /dev/sdf

mdadm --examine /dev/md30

mdadm --detail /dev/md30

Make file system

mkfs.ext4 -O extent -b 4096 -E stride=128,stripe-width=128 -O ^has_journal /dev/md30
tune2fs -o journal_data_writeback /dev/md30

# append output to /etc/mdadm.conf
mdadm --detail --scan|grep d30 >>/etc/mdadm.conf

mkfs.ext4 -O extent -b 4096 -E stride=128,stripe-width=128 -O ^has_journal /dev/md30

tune2fs -o journal_data_writeback /dev/md30

# append output to /etc/mdadm.conf

mdadm --detail --scan|grep d30 >>/etc/mdadm.conf

Add to /etc/fstab

echo "#">>/etc/fstab; echo "/dev/md30 /data ext4 discard,defaults,data=writeback 0 0" >>/etc/fstab

1	echo "#">>/etc/fstab; echo "/dev/md30 /data ext4 discard,defaults,data=writeback 0 0" >>/etc/fstab

Create home directory and access

mkdir /data
mount /data

1 2	mkdir /data mount /data

Add User and group

groupadd solr
useradd -d /home/solr -g solr -m -s /bin/bash -c "Solr Search" solr

1 2	groupadd solr useradd -d /home/solr -g solr -m -s /bin/bash -c "Solr Search" solr

Create solr directory & access

mkdir /data/solr;chown solr:solr /data/solr;chmod 770 /data/solr

passwd solr
devtech101solr#

mkdir /data/solr;chown solr:solr /data/solr;chmod 770 /data/solr

passwd solr

devtech101solr#

Source – howto migarte to raid on live system

Creating a Linux Bond With vLan Tags

June 8, 2016July 21, 2017 Eli Kleinman Leave a comment

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How to create a vlan interface and start at boot time. First check if the bounding module is loaded.

lsmod | grep 8021q

1	lsmod \| grep 8021q

/etc/sysconfig/network-scripts/ifcfg-solr

DEVICE=solr
TYPE=Ethernet
BOOTPROTO=none
ONBOOT=yes

DEVICE=solr

TYPE=Ethernet

BOOTPROTO=none

ONBOOT=yes

/etc/sysconfig/network-scripts/ifcfg-solr.2018

DEVICE=solr.2018
IPADDR=10.10.18.51
NETWORK=10.10.18.0
NETMASK=255.255.254.0
GATEWAY=10.10.18.1
ONBOOT=yes
BOOTPROTO=none
USERCTL=no
VLAN=yes

DEVICE=solr.2018

IPADDR=10.10.18.51

NETWORK=10.10.18.0

NETMASK=255.255.254.0

GATEWAY=10.10.18.1

ONBOOT=yes

BOOTPROTO=none

USERCTL=no

VLAN=yes

To test just issue

/etc/init.d/network restart
or
ifup [if_name]

/etc/init.d/network restart

ifup [if_name]

To remove the new vlan

How to remove VLAN ID 2018?

Type the following commands
# ip link set dev solr.2018 down
# ip link delete solr.2018

How to remove VLAN ID 2018?

Type the following commands

# ip link set dev solr.2018 down

# ip link delete solr.2018

How to configure bonding First make sure the bonding module is loaded, then create the configuration below /etc/sysconfig/network-scripts/ifcfg-bond0

DEVICE=bond0
BONDING_MASTER=yes
ONBOOT=yes
MTU=9000
NETWORK=10.151.18.0
NETMASK=255.255.254.0
IPADDR=10.151.18.51
BONDING_OPTS="mode=1 miimon=100"

DEVICE=bond0

BONDING_MASTER=yes

ONBOOT=yes

MTU=9000

NETWORK=10.151.18.0

NETMASK=255.255.254.0

IPADDR=10.151.18.51

BONDING_OPTS="mode=1 miimon=100"

/etc/sysconfig/network-scripts/ifcfg-dmznet_pvi […]

How to capture performance data in Linux

March 10, 2016March 3, 2017 Eli Kleinman Leave a comment

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Memory usage

while : ;do date;echo "================";ps -eo pid,pmem,rss,comm --sort rss|egrep "PID|java" |tail -12;echo "=================";sleep 5;done

1	while : ;do date;echo "================";ps -eo pid,pmem,rss,comm --sort rss\|egrep "PID\|java" \|tail -12;echo "=================";sleep 5;done

top example

nohup top -b -d 2 | egrep --color=auto "top|Task|Cpu|Mem|Swap|PID|elastic" >> top.out &

1	nohup top -b -d 2 \| egrep --color=auto "top\|Task\|Cpu\|Mem\|Swap\|PID\|elastic" >> top.out &

OEL + KVM

July 29, 2015March 3, 2017 Eli Kleinman Leave a comment

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Make sure to install

yum -y install qemu-kvm qemu-img virt-manager libvirt libvirt-python python-virtinst libvirt-client virt-install virt-viewer
yum -y install kvm libvirt python-virtinst virt-top virt-manager virt-v2v virt-viewer vim pv

1 2	yum -y install qemu-kvm qemu-img virt-manager libvirt libvirt-python python-virtinst libvirt-client virt-install virt-viewer yum -y install kvm libvirt python-virtinst virt-top virt-manager virt-v2v virt-viewer vim pv

Make sure to start/enable – Note: a reboot might be required

servicectl start/enable libvirtd.service libvirtd.socket libvirt-guests.service

1	servicectl start/enable libvirtd.service libvirtd.socket libvirt-guests.service

Now run virt-manager

Xsigo Linux – Manually Installing

July 20, 2015May 25, 2017 Eli Kleinman Leave a comment

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Installing the Oracle OVN (Xsigo) Linux driver First, Install the firmware. For example:

rpm -ivh <kernel-filename>.noarch.rpm

1	rpm -ivh <kernel-filename>.noarch.rpm

Then, Install the kernel module. For example:

rpm -ivh <kernel-filename>

1	rpm -ivh <kernel-filename>

Next, Install the Oracle Virtual Networking user space application. For example:

rpm -ivh oclovn-user.x86_64.rpm

1	rpm -ivh oclovn-user.x86_64.rpm

When the kernel is installed on the host, and the correct kernel and OFED version are set as the first item […]

How to measure network Bandwidth in Linux

December 11, 2014March 3, 2017 Eli Kleinman Leave a comment

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Usage as below from same folder: To check packer per interface: ./netpps.sh eth0 To check speed per interface: ./netspeed.sh eth0 Measure Packets per Second on an Interface netpps.sh as file name

<span class="com">#!/bin/bash</span><span class="pln">

INTERVAL</span><span class="pun">=</span><span class="str">&quot;1&quot;</span><span class="pln">  </span><span class="com"># update interval in seconds</span><span class="pln">

</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">[</span><span class="pln"> </span><span class="pun">-</span><span class="pln">z </span><span class="str">&quot;$1&quot;</span><span class="pln"> </span><span class="pun">];</span><span class="pln"> </span><span class="kwd">then</span><span class="pln">
        echo
        echo usage</span><span class="pun">:</span><span class="pln"> $0 </span><span class="pun">[</span><span class="pln">network</span><span class="pun">-</span><span class="pln">interface</span><span class="pun">]</span><span class="pln">
        echo
        echo e</span><span class="pun">.</span><span class="pln">g</span><span class="pun">.</span><span class="pln"> $0 eth0
        echo
        echo shows packets</span><span class="pun">-</span><span class="pln">per</span><span class="pun">-</span><span class="pln">second
        exit
</span><span class="kwd">fi</span><span class="pln">

IF</span><span class="pun">=</span><span class="pln">$1

</span><span class="kwd">while</span><span class="pln"> true
</span><span class="kwd">do</span><span class="pln">
        R1</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/rx_packets`</span><span class="pln">
        T1</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/tx_packets`</span><span class="pln">
        sleep $INTERVAL
        R2</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/rx_packets`</span><span class="pln">
        T2</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/tx_packets`</span><span class="pln">
        TXPPS</span><span class="pun">=</span><span class="str">`expr $T2 - $T1`</span><span class="pln">
        RXPPS</span><span class="pun">=</span><span class="str">`expr $R2 - $R1`</span><span class="pln">
        echo </span><span class="str">&quot;TX $1: $TXPPS pkts/s RX $1: $RXPPS pkts/s&quot;</span><span class="pln">
</span><span class="kwd">done</span>

#!/bin/bash

INTERVAL="1" # update interval in seconds

if [ -z "$1" ]; then

echo

echo usage: $0 [network-interface]

echo

echo e.g. $0 eth0

echo

echo shows packets-per-second

exit

fi

IF=$1

while true

do

R1=`cat /sys/class/net/$1/statistics/rx_packets`

T1=`cat /sys/class/net/$1/statistics/tx_packets`

sleep $INTERVAL

R2=`cat /sys/class/net/$1/statistics/rx_packets`

T2=`cat /sys/class/net/$1/statistics/tx_packets`

TXPPS=`expr $T2 - $T1`

RXPPS=`expr $R2 - $R1`

echo "TX $1: $TXPPS pkts/s RX $1: $RXPPS pkts/s"

done

Measure Network Bandwidth on an Interface netspeed.sh as file name

<span class="com">#!/bin/bash</span><span class="pln">

INTERVAL</span><span class="pun">=</span><span class="str">&quot;1&quot;</span><span class="pln">  </span><span class="com"># update interval in seconds</span><span class="pln">

</span><span class="kwd">if</span><span class="pln"> </span><span class="pun">[</span><span class="pln"> </span><span class="pun">-</span><span class="pln">z </span><span class="str">&quot;$1&quot;</span><span class="pln"> </span><span class="pun">];</span><span class="pln"> </span><span class="kwd">then</span><span class="pln">
        echo
        echo usage</span><span class="pun">:</span><span class="pln"> $0 </span><span class="pun">[</span><span class="pln">network</span><span class="pun">-</span><span class="pln">interface</span><span class="pun">]</span><span class="pln">
        echo
        echo e</span><span class="pun">.</span><span class="pln">g</span><span class="pun">.</span><span class="pln"> $0 eth0
        echo
        exit
</span><span class="kwd">fi</span><span class="pln">

IF</span><span class="pun">=</span><span class="pln">$1

</span><span class="kwd">while</span><span class="pln"> true
</span><span class="kwd">do</span><span class="pln">
        R1</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/rx_bytes`</span><span class="pln">
        T1</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/tx_bytes`</span><span class="pln">
        sleep $INTERVAL
        R2</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/rx_bytes`</span><span class="pln">
        T2</span><span class="pun">=</span><span class="str">`cat /sys/class/net/$1/statistics/tx_bytes`</span><span class="pln">
        TBPS</span><span class="pun">=</span><span class="str">`expr $T2 - $T1`</span><span class="pln">
        RBPS</span><span class="pun">=</span><span class="str">`expr $R2 - $R1`</span><span class="pln">
        TKBPS</span><span class="pun">=</span><span class="str">`expr $TBPS / 1024`</span><span class="pln">
        RKBPS</span><span class="pun">=</span><span class="str">`expr $RBPS / 1024`</span><span class="pln">
        echo </span><span class="str">&quot;TX $1: $TKBPS kB/s RX $1: $RKBPS kB/s&quot;</span><span class="pln">
</span><span class="kwd">done</span>

#!/bin/bash

INTERVAL="1" # update interval in seconds

echo

echo e.g. $0 eth0

echo

exit

fi

IF=$1

while true

do

R1=`cat /sys/class/net/$1/statistics/rx_bytes`

T1=`cat /sys/class/net/$1/statistics/tx_bytes`

sleep $INTERVAL

R2=`cat /sys/class/net/$1/statistics/rx_bytes`

T2=`cat /sys/class/net/$1/statistics/tx_bytes`

TBPS=`expr $T2 - $T1`

RBPS=`expr $R2 - $R1`

TKBPS=`expr $TBPS / 1024`

RKBPS=`expr $RBPS / 1024`

echo "TX $1: $TKBPS kB/s RX $1: $RKBPS kB/s"

done

How to stress / CPUhog on a system

November 11, 2014March 3, 2017 Eli Kleinman Leave a comment

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http://people.seas.harvard.edu/~apw/stress/

How To Enable In Linux Specific User Logins (netgroup)

September 22, 2014August 7, 2017 Eli Kleinman Leave a comment

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Modify /etc/security/access.conf

+ : ALL : LOCAL
+ : @groupA : ALL
+ : userA : ALL
+ : root : ALL
+ : userB : ALL
-:ALL:ALL

+ : ALL : LOCAL

+ : @groupA : ALL

+ : userA : ALL

+ : root : ALL

+ : userB : ALL

-:ALL:ALL

How to mount a cdrom or disk in linux (thrue ilom)

May 20, 2014March 3, 2017 Eli Kleinman Leave a comment

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First get the device name dmesg | egrep -i –color 'cdrom|dvd|cd/rw|writer' Create mountpoint if not exsists mkdir /media/cdrom mkdir /media/disk Syntax to mount DVD / CDROM in Linux mount -t iso9660 -o ro /dev/deviceName /path/to/mount/point For Example mount -t iso9660 -o ro /dev/sr0 /cdrom Syntax to mount disk in Linux mount /dev/deviceName /path/to/mount/point

Category: oel-6

Linux Disk Management – Multipath Management

Linux RAID & LVM

Creating a Linux Bond With vLan Tags

How to capture performance data in Linux

OEL + KVM

Xsigo Linux – Manually Installing

How to measure network Bandwidth in Linux

How to stress / CPUhog on a system

How To Enable In Linux Specific User Logins (netgroup)

How to mount a cdrom or disk in linux (thrue ilom)

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