编译安装ntp

升级ssh时连带升级OpenSSL 后ntp无法启动,yum升级ntp无果,决定重新编译个.

#ntpd –version

ntpd – NTP daemon program – Ver. 4.2.4p8

#tail /var/log/messages

ntpd: OpenSSL version mismatch. Built against 10000003, you have 1000103f

删除原ntp

yum remove ntp

编译ntp

wget http://www.eecis.udel.edu/~ntp/ntp_spool/ntp4/ntp-4.2/ntp-4.2.6p5.tar.gz
tar zxvf ntp-4.2.6p5.tar.gz
cd ntp-4.2.6p5
./configure –prefix=/usr/local/ntp-4.2.6p5 –enable-all-clocks –enable-parse-clocks
make && make install

创建软链接
ln -s /usr/local/ntp-4.2.6p5 /usr/local/ntp

编辑配置文件
vi /etc/ntp.conf

driftfile /var/lib/ntp/drift

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

includefile /etc/ntp/crypto/pw

keys /etc/ntp/keys

运行ntp

/usr/local/ntp/bin/ntpd -c /etc/ntp.conf

检查同步情况

watch /usr/local/bin/ntpq -p

开机运行

echo ‘/usr/local/ntp/bin/ntpd -c /etc/ntp.conf’ >> /etc/rc.local

参考:
http://vbird.dic.ksu.edu.tw/linux_server/0440ntp/0440ntp-centos4.php