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testing-nfs
 

testing-nfs

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    testing-nfs testing-nfs Presentation Transcript

    • Highly Available NFS Server Scenario NFS Server1 nfs1.example.com 192.168.1.X NFS Server2 nfs2.example.com 192.168.1.X Virtual IP-Address 192.168.1.X NFS client For WebServers or FTP Servers
    • Install ubuntu-dapper on both system Crate two seprate partition on both /dev/hdax (For DRBD's meta data /dev/hday ( For Shared Directory like /web) /dev/hdax should be more than 128MB /dev/hday should be identical in size on both system Do not mount /dev/hdax and /dev/hday during installation How To Install Ubuntu
    • Installation and Configuration of DRBD 1) Synchronize System Time with date command or ntp 2) Install NFS server on both nfs1 and nfs2 sudo apt-get install nfs-kernel-server 3) Remove starup scripts , because heartbeat will controll NFS sudo update-rc.d -f nfs-kernel-server remove sudo update-rc.d -f nfs-common remove
    • 4) Create NFS Share on both nfs server /web/site 192.168.1.0/255.255.255.0(rw,no_root_squash,no_all_squash,sync) 5) Install Linux kernel headers and DRDB on both NFS Server sudo apt-get install linux-headers-`uname -r` sudo apt-get install drbd0.7-module-source sudo apt-get install drbd0.7-utils Installation and Configuration of DRBD Contd.....
    • Installation Contd...... cd /usr/src/ sudo tar xvfz drbd0.7.tar.gz cd modules/drbd/drbd sudo make sudo make install 6) Configure /etc/drbd.conf file on both NFS Server , and it must be identical vi /etc/drbd.conf resource r0 { protocol C; incon-degr-cmd "echo '!DRBD! pri on incon-degr' | mail abhishek.singh@fosteringlinux.com ; sleep 60"; startup { degr-wfc-timeout 120; # 2 minutes. }
    • Configuration Contd............... disk { on-io-error detach; } net { } syncer { rate 10M; group 1; al-extents 257; }
    • Configuration Contd............... on nfs1 { # ** EDIT ** the hostname of server 1 (uname -n) device /dev/drbd0; # disk /dev/hday; # ** EDIT ** data partition on server 1 address 192.168.1.x:7788; # ** EDIT ** IP address on server 1 meta-disk /dev/hdax[0]; #* EDIT * 128MB partition for DRBD onserver1 } on nfs2 { # ** EDIT ** the hostname of server 2 (uname -n) device /dev/drbd0; # disk /dev/hday; # ** EDIT ** data partition on server 2 address 192.168.1.x:7788; # ** EDIT ** IP address on server 2 meta-disk /dev/hdax[0]; # * EDIT * 128MB partition for DRBD on server 2 } } Replcae with slave NFS Server IP Address Replcae x and y with partition number Replcae with master NFS Server IP Address Replcae x and y with partition number
    • 6) Now load DRBD kernel module in memory modprobe drbd Note: Next time drbd init script will load the module drbdadm up all cat /proc/drbd 7)Make data consistent on both server Run following command on nfs1 machine drbdadm -- --do-what-I-say primary all drbdadm -- connect all cat /proc/drbd ( To check progress of data initial sync )
    • How To sync NFS lock and other information from Primary to Slave Server 1) Create Directory on both server mkdir /web 2) Do following on server nfs1 mount -t ext3 /dev/drbd0 /web mv /var/lib/nfs/ /web/ ln -s /web/nfs/ /var/lib/nfs mkdir /web/site umount /web 3) Do following on server nfs2 rm -fr /var/lib/nfs/ ln -s /web/nfs/ /var/lib/nfs
    • How To install and configure Hearbeat 1 ) Install Hearbeat on both the server sudo apt-get install heartbeat 2) Now Edit following three files on both NFS servers /etc/heartbeat/ha.cf logfacility local0 keepalive 2 deadtime 30 bcast eth0 node nfs1 nfs2 /etc/heartbeat/haresources nfs1 IPaddr::192.168.1.x/24/eth0 drbddisk::r0 Filesystem::/dev/drbd0::/web::ext3 nfs-kernel-server Replace with Virtual Ipaddress
    • Configuration Contd.............. 3)Set Password for heartbeat communication /etc/authkeys auth 3 3 md5 fosteringlinux 4) Make /etc/authkeys readble by root only chmod 600 /etc/authkeys Replace with your string
    • Start DRBD and heartbeat on both NFS server #sudo /etc/init.d/drbd start #sudo /etc/init.d/heartbeat start Testing 1) Check virtual ipaddress on master nfs server (nfs1) ifconfig mount 2) Do same on slave nfs server (nfs2) Note: There should not be virtual ipaddress and mounted /content directory
    • Testing Continued............. 2) Replicate Server Failure Create any directory or file on NFS server (nfs1) mkdir /web/site/failure Stop hearbeat on NFS server (nfs1) #sudo /etc/init.d/heartbeat stop 3) Check slave server Virtual Ipaddess ,exported /web ifconfig mount created failure directory should be there cd /web/site ls
    • 4) Do same on slave Create any file and directory in /web/site mkdir /web/site/success Stop heartbeat on Slave (nfs2) 5) Run these commands on master so now VIP and /web should be on master ifconfig mount df -h -T
    • Configure NFS Client mkdir /web mount -t nfs 192.168.1.x:/web/site /web Note: Replace 192.168.1.x with Virtual Ipaddress vi /etc/fstab 192.168.1.x:/web/site /web nfs rw 0 0 Replace with Virtual IP addess