as you might know, yum does not provide re-install functionality,
for re-installing yum installed application following methods may useful
yum install yum-utils
yumdownloader package
rpm -Uvh –force downloadedpackages
Install Postgrey on CentOS
Activate dag repository
[dag]
name=Dag RPM Repository for Red Hat Enterprise Linux
baseurl=http://apt.sw.be/redhat/el$releasever/en/$basearch/dag
gpgcheck=1
install package
root@ns99 ~ # yum install postgrey
edit startup script /etc/init.d/postgrey
#OPTIONS=”–unix=$SOCKET”
OPTIONS=”–whitelist-clients=/etc/postfix/postgrey_whitelist_clients –whitelist
recipients=/etc/postfix/postgrey_whitelist_recipients –inet=10023 -d –unix=$SOCKET”
startup postgrey when system is bootup
root@ns99 ~ # chkconfig postgrey on
install filter to postfix /etc/postfix/main.cf
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service inet:127.0.0.1:10023
edit white-list as you need /etc/postfix/postgrey_whitelist_clients
Check delay from maillog
cat /var/log/maillog | postgreyreport
Install SPF to CentOS Postfix
In computing, Sender Policy Framework (SPF) allows software to identify messages that are or are not authorized to use the domain name in the SMTP HELO and MAIL FROM (Return-Path) commands, based on information published in a sender policy of the domain owner. Forged return paths are common in e-mail spam and result inbackscatter. SPF is defined in RFC 4408. from wikipedia
Install require packages
root@ns99 ~ # yum install perl-Mail-SPF
Get SPF module from http://www.openspf.org/Software Newest at this time is 2.007 and Install SPF module
root@ns99 ~ # wget http://www.openspf.org/blobs/postfix-policyd-spf-perl-2.007.tar.gz root@ns99 ~ # tar zxvf postfix-policyd-spf-perl-2.007.tar.gz root@ns99 ~ # mv postfix-policyd-spf-perl-2.007/postfix-policyd-spf-perl /usr/local/lib.
add following line to /etc/postfix/master.cf
policy unix – n n – 0 spawn
user=nobody argv=/usr/bin/perl /usr/local/lib/policyd-spf-perl
add following line to /etc/postfix/main.cf
smtpd_recipient_restrictions = permit_mynetworks, reject_unauth_destination, check_policy_service,
check_policy_service unix:private/policy
policy_time_limit = 3600
Add SPF record to your DNS. SPF record can be wizardly made from http://old.openspf.org/wizard.html?mydomain=example.com&submit=Go%21
spf01 IN TXT “v=spf1 +ip4:xxx.xxx.xxx.xxx/24 ~all”
spf02 IN TXT “v=spf1 +ip4:yyy.yyy.yyy.yyy/24 ~all”
@ IN TXT “v=spf1 include:spf01.example.com include:spf02.example.com ~all”
Rebuild apache rpm on Centos4
Download src rpm
http://ftp.riken.jp/Linux/centos/4.7/centosplus/SRPMS/
httpd-2.0.63-2.el4s1.centos.2.src.rpm
Install src rpm
ns2 ~ # rpm -ivh httpd-2.0.63-2.el4s1.centos.2.src.rpm
ns2 ~ # cd /usr/src/redhat/SPECS
ns2 SPECS # vim httpd.spec
%define contentdir /var/www -> %define contentdir /home
ns2 SPECS # rpmbuild -bb /usr/src/redhat/SPECS/httpd.spec
error: Failed build dependencies:
xmlto >= 0.0.11 is needed by httpd-2.0.63-2.el4s1.centos.2.i386
apr-devel >= 0.9.4-20 is needed by httpd-2.0.63-2.el4s1.centos.2.i386
apr-util-devel is needed by httpd-2.0.63-2.el4s1.centos.2.i386
distcache-devel is needed by httpd-2.0.63-2.el4s1.centos.2.i386
Install missing packages
ns2 SPECS # yum install xmlto apr-devel apr-util-devel distcache-devel
ns2 SPECS # rpmbuild -bb /usr/src/redhat/SPECS/httpd.spec
ns2 SPECS # cd ../RPMS
ns2 RPMS # rpm -ivh –force httpd-2.0.63-2.el4s1.centos.2.i386.rpm
ns2 ~ # /etc/init.d/httpd restart
ns2 ~ # suexec -V