November 2008 Archives

Below is a portion of the Cisco config where pxeboot is defined for the dhcp pool net. You'll notice 192.168.0.250 is defined as the next-server. Therefore you just need to make sure 192.168.0.250 is setup with tftp access and the proper pxelinux config is setup.

ip dhcp pool net

   import all

   network 192.168.0.0 255.255.255.0

   bootfile pxelinux.0

   next-server 192.168.0.250

   dns-server 192.168.0.5 192.168.0.6

   default-router 192.168.0.1

   domain-name domain.com

   lease infinite

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

cat > /etc/snmp/snmpd.conf << 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

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

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

The following is the script I use to install and configure DoveCot on RHEL of CentOS. In summary, the script is doing the following:

1. Installing DoveCot
2. Setup the dovecot.conf configuration file
3. Enabling dovecot to start upon bootup
4. Startup dovecot

yum install dovecot -y


cp /etc/dovecot.conf /etc/dovecot.conf.orig

cat > /etc/dovecot.conf << EOF

protocols = imap imaps

protocol imap {

}

protocol lda {

  postmaster_address = postmaster@domain.com

}

auth default {

  mechanisms = plain

  passdb pam {

  }

  userdb passwd {

  }

  user = root

}

dict {

}



plugin {

}

EOF

chkconfig dovecot on

service dovecot restart

Once the script is completed, you can go ahead and use your mail client to connect to your server. The configuration file used here is for a IMAP(s) mail server.

Below is the script I use to install and configure Postfix. My configuration requires that I use a outbound relay host, a smtp server from Postini. In summary, this script will do the following:

1. Install Postfix
2. Setup the main.cf configuration file
3. Setup the virtual configuration file
4. Execute postmap on the virtual file
5. Enable Postfix to start upon bootup
6. Disable Sendmail
7. Shutdown Sendmail
8. Startup Postfix

yum install postfix -y


cp /etc/postfix/main.cf /etc/postfix/main.cf.orig

cat > /etc/postfix/main.cf << EOF

myhostname = mail01.srv.domain.com

myorigin = $myhostname

mydestination = $myhostname, localhost.$mydomain, localhost

mynetworks = 192.168.0.0/24

virtual_alias_domains = domain.com domain2.com

virtual_alias_maps = hash:/etc/postfix/virtual

relayhost = outboundsXXX.obsmtp.com # postini

queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/libexec/postfix

mail_owner = postfix

inet_interfaces = localhost, mail01

unknown_local_recipient_reject_code = 550

alias_maps = hash:/etc/aliases

alias_database = hash:/etc/aliases

sendmail_path = /usr/sbin/sendmail.postfix

newaliases_path = /usr/bin/newaliases.postfix

mailq_path = /usr/bin/mailq.postfix

setgid_group = postdrop

html_directory = no

manpage_directory = /usr/share/man

sample_directory = /usr/share/doc/postfix-2.3.3/samples

readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES

EOF

cp /etc/postfix/virtual /etc/postfix/virtual.orig

cat > /etc/postfix/virtual << EOF

# postmap /etc/postfix/virtual

postmaster@domain.com           user1

user1@domain.com                user1

user.one@domain.com             user1

@domain.com                     user1

postmaster@domain2.com  user1

@domain2.com                    user1

EOF

postmap /etc/postfix/virtual

chkconfig --add postfix

chkconfig postfix on

chkconfig sendmail off

service sendmail stop

service postfix restart

To find out if your Apple hardware is covered under warranty. Visit Apple's Online Service Assistant. Just plug in your serial number, select the country and Apple's system will tell you if you're covered.

https://selfsolve.apple.com/GetWarranty.do

Below are the contents of a script I use to install cacti on either RHEL or CentOS. In summary, the script does the following.

1. Configures the rpmforge repository
2. Updates all the rpms on the box
3. Removes 1.2.28 of RRDtool (currently broken)
4. Installs 1.2.27 of RRDtool
5. Installs Cacti
6. Installs MySQL
7. Enables MySQL & Apache to start on bootup
8. Starts MySQL & Apache
9. Initialize the Cacti database
10. Adds the poller job to root crontab
11. Update the cacti.conf file for Apache

With that said, you can go ahead and login to Cacti and configure Cacti. If you need more help on Cacti, refer to documentation on Cacti's website.

cd /tmp


# Setup rpmforge repo

rpm --import http://dag.wieers.com/rpm/packages/RPM-GPG-KEY.dag.txt

wget http://dag.wieers.com/rpm/packages/rpmforge-release/rpmforge-release-0.3.6-1.el5.rf.i386.rpm

rpm -ivh rpmforge-release-0.3.6-1.el5.rf.i386.rpm

yum update -y

# rrdtool 1.2.28 is broken - remove 1.2.28 and install 1.2.27

yum remove rrdtool -y

rpm -ivh ftp://rpmfind.net/linux/EPEL/5Client/i386/rrdtool-1.2.27-3.el5.i386.rpm

# install cacti et al

yum install cacti -y

yum install mysql-server -y

chkconfig mysqld on

chkconfig httpd on

service mysqld start

service httpd start

mysqladmin --user=root create cacti

cd /var/www/cacti

mysql cacti < cacti.sql

cat > /tmp/perm.sql << EOF

GRANT ALL ON cacti.* TO cactiuser@localhost IDENTIFIED BY 'cactiuser';

flush privileges;

exit

EOF

mysql mysql < /tmp/perm.sql


cat >> /var/spool/cron/root  << EOF

*/5 * * * * cacti php /var/www/cacti/poller.php > /dev/null 2>&1

EOF

cat > /etc/httpd/conf.d/cacti.conf << EOF

Alias /cacti/ /var/www/cacti/

    DirectoryIndex index.php

    Options -Indexes

    AllowOverride all

    order deny,allow

    deny from all

    #allow from 127.0.0.1

    allow from all

    AddType application/x-httpd-php .php

    php_flag magic_quotes_gpc on

    php_flag track_vars on



EOF

service httpd restart

echo "Login to the server via browser at http://`hostname`/cacti/index.php"

echo "login and password is admin"

The following are examples of the different configuration you can use to connect to an Oracle database. With Load Balancing:

sales.us.acme.com=

 (DESCRIPTION=

  (ADDRESS_LIST=

(LOAD_BALANCE=on)

   (ADDRESS=(PROTOCOL=tcp)(HOST=sales1-server)(PORT=1521)) 

   (ADDRESS=(PROTOCOL=tcp)(HOST=sales2-server)(PORT=1521)))

  (CONNECT_DATA=

    (SERVICE_NAME=sales.us.acme.com))) 

With Connect-Time Failover:

sales.us.acme.com=

 (DESCRIPTION=

  (ADDRESS_LIST=

(LOAD_BALANCE=off)

(FAILOVER=ON)

   (ADDRESS=(PROTOCOL=tcp)(HOST=sales1-server)(PORT=1521)) 

   (ADDRESS=(PROTOCOL=tcp)(HOST=sales2-server)(PORT=1521)))

  (CONNECT_DATA=(SERVICE_NAME=sales.us.acme.com)))

With Advanced Connect Data Parameters (SERVICE_NAME defines a service called sales.us.acme.com):

sales.us.acme.com=

 (DESCRIPTION=

   (ADDRESS=(PROTOCOL=tcp)(HOST=sales-server)(PORT=1521))

(CONNECT_DATA=

 (SERVICE_NAME=sales.us.acme.com))) 

Create a 500g volume with space guaranteed for the volume.

vol create new_vol -s volume aggr0 500g

Resize the volume if needed

vol size new_vol 600g

Offline and destroy volume if a mistake was made

vol offline new_vol

vol destroy new_vol

Create the qtree

qtree create /vol/new_vol/new_qtree

Create the 50g LUNs for Solaris

lun create -s 50g -t solaris /vol/new_vol/new_qtree/new101_lun

lun create -s 50g -t solaris /vol/new_vol/new_qtree/new102_lun

lun create -s 50g -t solaris /vol/new_vol/new_qtree/new103_lun

lun create -s 50g -t solaris /vol/new_vol/new_qtree/new104_lun

Map the LUNs

lun map /vol/new_vol/new_qtree/new101_lun SYSTEM01 101

lun map /vol/new_vol/new_qtree/new102_lun SYSTEM01 102

lun map /vol/new_vol/new_qtree/new103_lun SYSTEM01 103

lun map /vol/new_vol/new_qtree/new103_lun SYSTEM01 104

vtoc

cat > /tmp/vtoc50g << EOF

       0      0    00      16384 104808448 104824831

       2      5    01          0 104824832 104824831

EOF

Label disks and apply layout

fmthard -s /tmp/vtoc50g /dev/rdsk/c10t600xxxxxxd101s2

fmthard -s /tmp/vtoc50g /dev/rdsk/c10t600xxxxxxd102s2

fmthard -s /tmp/vtoc50g /dev/rdsk/c10t600xxxxxxd103s2

fmthard -s /tmp/vtoc50g /dev/rdsk/c10t600xxxxxxd104s2

Update permissions

chown oracle:dba /dev/rdsk/c10t600*d10*

chown oracle:dba /dev/dsk/c10t600*d10*

The DBA can now go ahead with adding the disks underl ASM control.