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2016-06-23T13:04:32Z

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	<h3> yum </h3>		<h3> yum </h3>

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Lhep at 11:54, 19 September 2011

2011-09-19T11:54:16Z

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<h3> yum </h3>

- make sure to have a /etc/profile.d/proxy.sh with
export http_proxy=http://proxy.unibe.ch:80

- make sure to have a line with the IP of the localhost in /etc/hosts
example:
127.0.0.1 localhost.localdomain localhost
==> this one ==> 130.92.139.94 lheppc44.unibe.ch lheppc44 pc44

- "yum clean all" is a good first thing to do when getting stuck

<h3> copy large directories </h3>

- seen rsync not to work (runs and runs and runs and runs.... and does nothing...)

- example of "tar" use with "ssh":
tar c -P -f - /terabig | ssh root@lheppc44 tar x -P

- to sync with the files changed in the last 5h:
tar c -P -f - `find /terabig -cmin -300` | ssh root@lheppc44 tar x -P

<h3> Ganglia</h3>

rpm -Uvh /terabig/atlsoft/slc4/ganglia-gmond-3.0.3-1.rhel4.x86_64.rpm

<h3> LDAP</h3>

- MAIN LDAP server lhepp44
- lheppc7 is replica server (using syncrepl)
- on both, ldap starts at boot time
- a backup of the DB in ~webermi

- to create a replica, add the following in /etc/openldap/slapd.conf:

For the PROVIDER server:
access to attr=userPassword
by dn="uid=syncuser,dc=atlas-unibe,dc=ch" read <== to add acces to passwords to user syncuser

For the REPLICA server:
# Sync the LDAP database with lheppc44
syncrepl rid=001
provider=ldap://lheppc44:389
type=refreshOnly
interval=01:00:00:00
bindmethod=simple
searchbase="dc=atlas-unibe,dc=ch"
binddn="uid=syncuser,dc=atlas-unibe,dc=ch"
credentials=******** (the secret password)

(Following is obsolete) Problem on booting (on pc50 ?) since 1/9/09 (slapd does not run as user ldap, but only as root...:
- boot in single user mode
- maybe needed: go to /var/lib/ldap and run 'db_recover -c -h /tmp/ldap'
- maybe needed: copy /tmp/ldap/log.0000[something] to /var/lib/ldap'
- start sldapd manually (i.e. execude slapd)
- init 5

<h3> cfengine </h3>
server: lheppc10

- For a new machine for ATLAS:
yum install cfengine
yum install rapidsvn (if needed)
svn co http://svn.lhep.unibe.ch/subv/atlas/cfengine/masterfiles/inputs /var/cfengine/inputs
you may need to run cfkey
cfagent -q
[done]

- To force an update on all nodes, do a 'cfrun' on the cfengine server

- On the server, svn co http://svn.lhep.unibe.ch/subv/atlas/cfengine/masterfiles /var/cfengine/masterfiles,
and start cfservd

<h3> Bonding of eth0 and eth1 to bond0 (example pc51) </h3>
/etc/sysconfig/network-scripts/ifcfg-bond0
TYPE=Ethernet
DEVICE=bond0
BOOTPROTO='static'
IPADDR=130.92.139.151
NETMASK=255.255.255.0
GATEWAY=130.92.139.1
NETWORK=130.92.139.0
BROADCAST=130.92.139.255
ONBOOT=yes
USERCTL=no
NAME='Bonding device 0'
STARTMODE='auto'
IPV6INIT=no
PEERDNS=yes

/etc/sysconfig/network-scripts/ifcfg-eth0
TYPE=Ethernet
DEVICE=eth0
SLAVE=yes
MASTER=bond0
BOOTPROTO=none
HWADDR=00:15:17:4C:6A:D8
ONBOOT=yes

/etc/sysconfig/network-scripts/ifcfg-eth1
TYPE=Ethernet
DEVICE=eth1
SLAVE=yes
MASTER=bond0
BOOTPROTO=none
ONBOOT=yes

/etc/modprobe.conf # Had to add the last line on 2009-05-22 to get the bounding work.
alias scsi_hostadapter usb-storage
alias scsi_hostadapter1 ahci
alias eth0 e1000
alias eth1 e1000
alias scsi_hostadapter2 3w-9xxx
alias usb-controller ehci-hcd
alias usb-controller1 uhci-hcd
alias bond0 bonding
alias char-major-89 i2c-dev
install bond0 /sbin/modprobe/ bonding -o bonding0 mode=1 miimon=100

<h3> How to create a new hotspare after drive failure </h3>

tw_cli
maint createunit c0 rspare p6

where you must replace c0 with your controller and p6 with the port the drive is at

<h3> How to test network performance between nodes </h3>

Comment: the tool "netcat" or "nc" is used to create very simple network connections. On some system, the tool is named "nc", where on other sytsems it is "netcat". So replace where appropriate.

On the receiving host: enter: (you don't need to be root)
netcat -v -v -l -n -p 2222 > /dev/null
This opens the network port 2222, and discards everything that it receives (/dev/null)

On the sending host, type: (replace <IPoflisteninghost> with the IP address of the host above )
time yes | nc -v -v -n <IPoflisteninghost> 2222 >/dev/null
This sends thousands of "y"'s to the listening host.

After some time, you can abort (control-C) and you will seh how many bytes were sent. You can calculate the average speed by dividing by the time you let the test run.

Keep in mind that the sped s always limited by the slowest machine. So if you have set up network bonding, you should consider running severel servers at a tim eon the receiving host, and connecting from several machines:
To test the full speed, I opened severel ports (2222, 2223, 2224) and sent from pc44, pc50, and lhepatsomething.

Admin how-to - Revision history

Lhep at 13:04, 23 June 2016

Lhep: 1 revision imported

Lhep at 11:54, 19 September 2011