Posts Tagged ‘rhel’

LVM Removing PV device

[root@rhel ~]# pvdisplay
  /dev/sdb: read failed after 0 of 4096 at 0: Input/output error
 
echo 1 > /sys/class/scsi_device/0:0:1:0/device/delete
Posted: August 13th, 2011
Categories: linux, rhel
Tags: ,
Comments: No Comments.

LVM Missing UUID

Boot to rescue mode then…

lvm pvdisplay
lvm pvcreate --restorefile /etc/lvm/backup/VolGroup00 VolGroup00 --uuid <missing-uuid> <device-/dev/sdas>
lvm vgcfgrestore --file /etc/lvm/backup/VolGroup00 VolGroup00
Posted: August 13th, 2011
Categories: linux, os, rhel
Tags: ,
Comments: No Comments.

HP RAID Controller Diagnostics using hpacucli on Red Hat Enterprise Linux

rpm -ivh hpacucli-8.60-8.0.noarch.rpm

3 examples below…
ctrl all show
ctrl all show config
ctrl all show config detail

[root@hp ~]# hpacucli ctrl all show
 
Smart Array P410 in Slot 2                (sn: SOME SERIAL)
Smart Array P410i in Slot 0 (Embedded)    (sn: SOME SERIAL)
[root@hp ~]# hpacucli ctrl all show config
 
Smart Array P410 in Slot 2                (sn: SOME SERIAL)
 
   array A (SAS, Unused Space: 0 MB)
 
 
      logicaldrive 1 (820.2 GB, RAID 50, OK)
 
      physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 146 GB, OK)
      physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 146 GB, OK)
      physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 146 GB, OK)
      physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 146 GB, OK)
      physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 146 GB, OK)
      physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SAS, 146 GB, OK)
      physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SAS, 146 GB, OK)
      physicaldrive 2I:1:8 (port 2I:box 1:bay 8, SAS, 146 GB, OK)
 
   SEP (Vendor ID PMCSIERA, Model  SRC 8x6G) 250 (WWID: SOME SERIAL)
 
 
Smart Array P410i in Slot 0 (Embedded)    (sn: SOME SERIAL)
 
   array A (SAS, Unused Space: 0 MB)
 
 
      logicaldrive 1 (546.8 GB, RAID 1+0, OK)
 
      physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 146 GB, OK)
      physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 146 GB, OK)
      physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 146 GB, OK)
      physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 146 GB, OK)
      physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 146 GB, OK)
      physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SAS, 146 GB, OK)
      physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SAS, 146 GB, OK)
      physicaldrive 2I:1:8 (port 2I:box 1:bay 8, SAS, 146 GB, OK)
[root@hp ~]# hpacucli ctrl all show config detail
 
Smart Array P410 in Slot 2
   Bus Interface: PCI
   Slot: 2
   Serial Number: SOME SERIAL
   Cache Serial Number: PBCDF0CRHZ300W
   RAID 6 (ADG) Status: Disabled
   Controller Status: OK
   Chassis Slot:
   Hardware Revision: Rev C
   Firmware Version: 3.00
   Rebuild Priority: Medium
   Expand Priority: Medium
   Surface Scan Delay: 15 secs
   Surface Scan Mode: Idle
   Queue Depth: Automatic
   Monitor and Performance Delay: 60 min
   Elevator Sort: Enabled
   Degraded Performance Optimization: Disabled
   Inconsistency Repair Policy: Disabled
   Wait for Cache Room: Disabled
   Surface Analysis Inconsistency Notification: Disabled
   Post Prompt Timeout: 0 secs
   Cache Board Present: True
   Cache Status: OK
   Accelerator Ratio: 25% Read / 75% Write
   Drive Write Cache: Disabled
   Total Cache Size: 1024 MB
   No-Battery Write Cache: Disabled
   Cache Backup Power Source: Capacitors
   Battery/Capacitor Count: 1
   Battery/Capacitor Status: OK
   SATA NCQ Supported: True
 
   Array: A
      Interface Type: SAS
      Unused Space: 0 MB
      Status: OK
 
 
 
      Logical Drive: 1
         Size: 820.2 GB
         Fault Tolerance: RAID 50
         Number of Parity Groups: 2
         Heads: 255
         Sectors Per Track: 32
         Cylinders: 65535
         Strip Size: 64 KB
         Status: OK
         Array Accelerator: Enabled
         Parity Initialization Status: Initialization Completed
         Unique Identifier: 600508B100103956595631505A380300
         Disk Name: /dev/cciss/c1d0
         Mount Points: None
         Logical Drive Label: A0209451SOME SERIAL7F50
         Parity Group 0:
            physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 146 GB, OK)
            physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 146 GB, OK)
            physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 146 GB, OK)
            physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SAS, 146 GB, OK)
         Parity Group 1:
            physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 146 GB, OK)
            physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 146 GB, OK)
            physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SAS, 146 GB, OK)
            physicaldrive 2I:1:8 (port 2I:box 1:bay 8, SAS, 146 GB, OK)
 
      physicaldrive 1I:1:1
         Port: 1I
         Box: 1
         Bay: 1
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1RN0300009051BF0U
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:2
         Port: 1I
         Box: 1
         Bay: 2
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SWW500009051BDJQ
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:3
         Port: 1I
         Box: 1
         Bay: 3
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1STSP00009051YRRF
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:4
         Port: 1I
         Box: 1
         Bay: 4
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1S7H800009051H7ZU
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:5
         Port: 2I
         Box: 1
         Bay: 5
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB182KT00009051H7YY
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:6
         Port: 2I
         Box: 1
         Bay: 6
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB182AF00009051H20G
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:7
         Port: 2I
         Box: 1
         Bay: 7
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SV2D00009051BGS0
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:8
         Port: 2I
         Box: 1
         Bay: 8
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB181MN00009051Z0TS
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
 
   SEP (Vendor ID PMCSIERA, Model  SRC 8x6G) 250
      Device Number: 250
      Firmware Version: RevC
      WWID: SOME SERIAL
      Vendor ID: PMCSIERA
      Model:  SRC 8x6G
 
 
Smart Array P410i in Slot 0 (Embedded)
   Bus Interface: PCI
   Slot: 0
   Serial Number: SOME SERIAL
   RAID 6 (ADG) Status: Disabled
   Controller Status: OK
   Chassis Slot:
   Hardware Revision: Rev C
   Firmware Version: 3.00
   Rebuild Priority: Medium
   Expand Priority: Medium
   Surface Scan Delay: 15 secs
   Surface Scan Mode: Idle
   Wait for Cache Room: Disabled
   Surface Analysis Inconsistency Notification: Disabled
   Post Prompt Timeout: 0 secs
   Cache Board Present: False
   Drive Write Cache: Disabled
   SATA NCQ Supported: True
 
   Array: A
      Interface Type: SAS
      Unused Space: 0 MB
      Status: OK
 
 
 
      Logical Drive: 1
         Size: 546.8 GB
         Fault Tolerance: RAID 1+0
         Heads: 255
         Sectors Per Track: 32
         Cylinders: 65535
         Strip Size: 128 KB
         Status: OK
         Unique Identifier: 600508B1001030394241393441301000
         Disk Name: /dev/cciss/c0d0
         Mount Points: /boot 101 MB
         OS Status: LOCKED
         Logical Drive Label: A000A241SOME SERIAL0ABC
         Mirror Group 0:
            physicaldrive 1I:1:1 (port 1I:box 1:bay 1, SAS, 146 GB, OK)
            physicaldrive 1I:1:2 (port 1I:box 1:bay 2, SAS, 146 GB, OK)
            physicaldrive 1I:1:3 (port 1I:box 1:bay 3, SAS, 146 GB, OK)
            physicaldrive 1I:1:4 (port 1I:box 1:bay 4, SAS, 146 GB, OK)
         Mirror Group 1:
            physicaldrive 2I:1:5 (port 2I:box 1:bay 5, SAS, 146 GB, OK)
            physicaldrive 2I:1:6 (port 2I:box 1:bay 6, SAS, 146 GB, OK)
            physicaldrive 2I:1:7 (port 2I:box 1:bay 7, SAS, 146 GB, OK)
            physicaldrive 2I:1:8 (port 2I:box 1:bay 8, SAS, 146 GB, OK)
 
      physicaldrive 1I:1:1
         Port: 1I
         Box: 1
         Bay: 1
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SVAA00009051H17G
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:2
         Port: 1I
         Box: 1
         Bay: 2
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SV9Y00009051K2C3
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:3
         Port: 1I
         Box: 1
         Bay: 3
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1RP4R00009051AHF9
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 1I:1:4
         Port: 1I
         Box: 1
         Bay: 4
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1S8Y3000090462D2G
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:5
         Port: 2I
         Box: 1
         Bay: 5
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SXSC00009051JQNT
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:6
         Port: 2I
         Box: 1
         Bay: 6
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SYHC00009049MP37
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:7
         Port: 2I
         Box: 1
         Bay: 7
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1T7HD000090335RAR
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
 
      physicaldrive 2I:1:8
         Port: 2I
         Box: 1
         Bay: 8
         Status: OK
         Drive Type: Data Drive
         Interface Type: SAS
         Size: 146 GB
         Rotational Speed: 15000
         Firmware Revision: HPDE
         Serial Number: 3TB1SVN600009041KXNP
         Model: HP      EH0146FAWJB
         PHY Count: 2
         PHY Transfer Rate: 6.0GBPS, Unknown
Posted: March 28th, 2011
Categories: hp, os, rhel, servers
Tags: , , ,
Comments: No Comments.

Installing & Configuring DHCP on Red Hat Enterprise Linux

yum install dhcp -y
 
cp /etc/dhcpd.conf /etc/dhcpd.conf.orig
 
cat > /etc/dhcpd.conf << EOF
ddns-update-style interim;
ignore client-updates;
allow booting;
allow bootp;
option option-128 code 128 = string;
option option-129 code 129 = text;
next-server TFTP.IP; 
filename "/pxelinux.0";
 
subnet IP.SUBNET netmask 255.255.255.0 {
       option routers                  GW.IP; #Default Gateway
       option subnet-mask              255.255.255.0;
       option domain-name              "test.local";
       option domain-name-servers      DNS1;
       #option netbios-name-servers     WINS1;
       range dynamic-bootp DHCP1 DHCP2;  #DHCP Range to assign
       default-lease-time 43200;
       max-lease-time 86400;
}
 
EOF
 
cp /etc/sysconfig/dhcpd /etc/sysconfig/dhcpd.orig
cat > /etc/sysconfig/dhcpd << EOF
DHCPDARGS=eth0
EOF
 
service dhcpd restart
chkconfig dhcpd on
Posted: March 28th, 2011
Categories: rhel
Tags: , ,
Comments: No Comments.

Installing memcacehd for apache on red hat enterprise linux

yum install memcached.x86_64 php-pecl-memcached.x86_64 -y
 
chkconfig memcached on
service memcached start
service httpd restart
Posted: March 28th, 2011
Categories: os, rhel
Tags: , , ,
Comments: No Comments.

Installing & Configuring NTP on Linux CentOS & RHEL

yum install ntp -y

mv /etc/ntp.conf /etc/ntp.conf.orig
cat > /etc/ntp.conf << EOF
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org
fudge  127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
keys /etc/ntp/keys
EOF
chkconfig ntpd on
service ntpd restart
ntpq -p
Posted: October 6th, 2009
Categories: centos, linux, rhel
Tags: , , ,
Comments: No Comments.

Installing & Configuring PXEboot TFTP Server for Kickstart on RHEL or CentOS

  • PXEboot TFTP Server
  • Kickstart Server
yum install tftp-server xinetd -y
cat &gt; /etc/xinetd.d/tftp &lt;&lt; EOF
service tftp
{
socket_type             = dgram
protocol                = udp
wait                    = yes
user                    = root
server                  = /usr/sbin/in.tftpd
server_args             = -s /tftpboot
disable                 = no
per_source              = 11
cps                     = 100 2
flags                   = IPv4
}
EOF
cp /usr/lib/syslinux/pxelinux.0 /tftpboot/.
chmod 644 /tftpboot/pxelinux.0
mkdir /tftpboot/pxelinux.cfg
cat &gt; /tftpboot/pxelinux.cfg/default &lt;&lt; EOF
default install
prompt 1
display pxeboot.msg
label install
kernel vmlinuz
append initrd=initrd.img
label kickstart-server01
kernel vmlinuz
append ksdevice=eth0 console=ttyS0,38400 console=tty0 load_ramdisk=1 initrd=initrd.img network ks=http://10.10.10.10/server01.cfg
EOF
cd /tftpboot
wget http://mirrors.atlanticmetro.net/centos/5/os/i386/isolinux/vmlinuz
wget http://mirrors.atlanticmetro.net/centos/5/os/i386/isolinux/initrd.img
wget http://mirrors.atlanticmetro.net/centos/5/os/i386/isolinux/memtest
wget http://mirrors.atlanticmetro.net/centos/5/os/i386/isolinux/boot.msg
wget http://mirrors.atlanticmetro.net/centos/5/os/i386/isolinux/splash.lss
mv boot.msg pxeboot.msg
service xinetd restart
Posted: December 4th, 2008
Categories: centos, linux, rhel
Tags: , , , ,
Comments: No Comments.

Issue with LDAP on RHEL or CentOS

If you bump into the following message on your box.

Checking configuration files for slapd:
bdb_db_open: unclean shutdown detected; attempting recovery.
bdb_db_open: Recovery skipped in read-only mode.
Run manual recovery if errors are encountered.

Change the ownership of /var/lib/ldap/DB_CONFIG to be owned by the user ldap and group ldap, then restart ldap.

chown ldap:ldap /var/lib/ldap/DB_CONFIG
service ldap restart

If you do have a issue with your database, you can try to repair it.

/usr/sbin/slapd_db_recover -v -h /var/lib/ldap
Posted: December 2nd, 2008
Categories: centos, directory services, ldap, linux, os, rhel
Tags: , , ,
Comments: No Comments.

Installing & Configuring SNMP on RHEL or CentOS

The script below was used to install and configure SNMP on a RHEL or CentOS box to act as a SNMP agent. This is a minimal configuration which can be tweaked for more functionality. In summary, the script does the following:

  1. Install net-snmp
  2. Setup snmpd.conf (minimal) configuration file
  3. Enable net-snmp to startup upon bootup
  4. Startup net-snmp
yum install net-snmp -y
cp /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig
<br />
cat &gt; /etc/snmp/snmpd.conf &lt;&lt; EOF
rocommunity public
com2sec  local       localhost        public
com2sec  network_1   172.16.0.0/24    public
com2sec  network_2   192.168.0.0/24   public
group    MyROGroup_1        v1                local
group    MyROGroup_1        v1                network_1
group    MyROGroup_2        v2c               network_2
view all-mibs         included   .1           80
access  MyROGroup_1  ""       v1       noauth    exact  all-mibs none   none
access  MyROGroup_2  ""       v2c      noauth    exact  all-mibs none   none
EOF
chkconfig snmpd on
service snmpd restart
Posted: November 26th, 2008
Categories: centos, linux, rhel
Tags: , , ,
Comments: No Comments.

Installing & Configuring NTP on RHEL or CentOS

The script below was used to configure the RHEL or CentOS host to act as an NTP client to the CentOS NTP pool. In summary, the script below does the following:

  1. Install ntp
  2. Setup the ntp.conf configuration file
  3. Enable ntp to startup upon bootup
  4. Startup ntp
  5. Execute ntpq to verify the box is acting as a ntp client
yum install ntp -y
cp /etc/ntp.conf /etc/ntp.conf.orig
<br />
cat &gt; /etc/ntp.conf &lt;&lt; EOF
restrict default kod nomodify notrap nopeer noquery
restrict -6 default kod nomodify notrap nopeer noquery
restrict 127.0.0.1
restrict -6 ::1
server 0.centos.pool.ntp.org
server 1.centos.pool.ntp.org
server 2.centos.pool.ntp.org
fudge   127.127.1.0 stratum 10
driftfile /var/lib/ntp/drift
keys /etc/ntp/keys
EOF
chkconfig ntpd on
service ntpd restart
ntpq -p
Posted: November 26th, 2008
Categories: centos, linux, rhel
Tags: , ,
Comments: No Comments.