I'm following the tutorial on creating a MySQL cluster on 4 machines: mysql-1: load balancer (primary) and cluster management mysql-2: MySQL SQL node 1 mysql-3: MySQL SQL node 2 mysql4: load balancer (secondary) All machines previously only had a base install of Fedora 7. I've got the MySQL cluster up and running great, but I'm having trouble with the load balancing via heartbeat. Here is the output I receive whenever I try to stop ldirectout or start heartbeat: [root@mysql-1 ~]# /etc/init.d/ldirectord stop Stopping ldirectord Error [] reading file /etc/ha.d/ldirectord.cf at line 8: Unknown command service=mysql [FAILED] [root@mysql-1 ~]# /etc/init.d/heartbeat start logd is already running Starting High-Availability services: Error [] reading file /etc/ha.d/ldirectord.cf at line 8: Unknown command service=mysql [ OK ] However, mysql client is installed (on both load balancers, mysql-1 and mysql4), as verified on mysql-1 with: [root@mysql-1 ~]# mysql -u ldirector -h xxx.xxx.xxx.242 -P 3306 -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 8 Server version: 5.0.45 MySQL Community Server (GPL) Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> and on mysql4 with: [root@mysql4 ~]# mysql -u ldirector -h xxx.xxx.xxx.243 -P 3306 -p Enter password: Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 5 Server version: 5.0.45 MySQL Community Server (GPL) Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> So, using the installed mysql client on mysql-1 or mysql4, the two load balancers, I am able to connect to either of the two sql nodes just fine. Here are all my configuration files: From mysql-1 (cluster management, and primary load balancer): /etc/modules: ip_vs_dh ip_vs_ftp ip_vs ip_vs_lblc ip_vs_lblcr ip_vs_lc ip_vs_nq ip_vs_rr ip_vs_sed ip_vs_sh ip_vs_wlc /etc/sysctl.conf: # Kernel sysctl configuration file for Red Hat Linux # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 /etc/ha.d/ha.cf logfacility local0 bcast mcast eth0 225.0.0.1 694 1 0 auto_failback off node mysql-1 node mysql4 respawn hacluster /usr/lib/heartbeat/ipfail apiauth ipfail gid=haclient uid=hacluster /etc/ha.d/haresources mysql-1 ldirectord::ldirectord.cf \ LVSSyncDaemonSwap::master \ IPaddr2::192.168.0.105/24/eth0/192.168.0.255 /etc/ha.d/authkeys auth 3 3 md5 mypassword /etc/ha.d/ldirectord.cf # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual=192.168.0.105:3306 service=mysql real=xxx.xxx.xxx.242:3306 gate real=xxx.xxx.xxx.243:3306 gate checktype=negotiate login="ldirector" passwd="ldirectorpass" database="ldirectordb" request="SELECT * FROM connectioncheck" scheduler=wrr From mysql4 (secondary load balancer): /etc/modules ip_vs_dh ip_vs_ftp ip_vs ip_vs_lblc ip_vs_lblcr ip_vs_lc ip_vs_nq ip_vs_rr ip_vs_sed ip_vs_sh ip_vs_wlc /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 1 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 /etc/ha.d/ha.cf logfacility local0 bcast mcast eth0 225.0.0.1 694 1 0 auto_failback off node mysql-1 node mysql4 respawn hacluster /usr/lib/heartbeat/ipfail apiauth ipfail gid=haclient uid=hacluster /etc/ha.d/haresources mysql-1 ldirectord::ldirectord.cf \ LVSSyncDaemonSwap::master \ IPaddr2::192.168.0.105/24/eth0/192.168.0.255 /etc/ha.d/authkeys auth 3 3 md5 mypassword /etc/ha.d/ldirectord.cf # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual = 192.168.0.105:3306 service = mysql real = xxx.xxx.xxx.242:3306 gate real = xxx.xxx.xxx.243:3306 gate checktype = negotiate login = "ldirector" passwd = "ldirectorpass" database = "ldirectordb" request = "SELECT * FROM connectioncheck" scheduler = wrr From mysql-2 (sql node 1): /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Enable configuration of arp_ignore option net.ipv4.conf.all.arp_ignore = 1 # When an arp request is received on eth0, only respond if that address is # configured on eth0. In particular, do not respond if the address is # configured on lo net.ipv4.conf.eth0.arp_ignore = 1 # Ditto for eth1, add for all ARPing interfaces #net.ipv4.conf.eth1.arp_ignore = 1 # Enable configuration of arp_announce option net.ipv4.conf.all.arp_announce = 2 # When making an ARP request sent through eth0 Always use an address that # is configured on eth0 as the source address of the ARP request. If this # is not set, and packets are being sent out eth0 for an address that is on # lo, and an arp request is required, then the address on lo will be used. # As the source IP address of arp requests is entered into the ARP cache on # the destination, it has the effect of announcing this address. This is # not desirable in this case as adresses on lo on the real-servers should # be announced only by the linux-director. net.ipv4.conf.eth0.arp_announce = 2 # Ditto for eth1, add for all ARPing interfaces #net.ipv4.conf.eth1.arp_announce = 2 /etc/sysconfig/network-scripts/ifcfg-lo:0 DEVICE=lo:0 IPADDR=192.168.0.105 NETMASK=255.255.255.255 NETWORK=192.168.0.0 BROADCAST=192.168.0.255 ONBOOT=yes From mysql-3 (sql node 2): /etc/sysctl.conf # Kernel sysctl configuration file for Red Hat Linux # sysctl.conf(5) for more details. # Controls IP packet forwarding net.ipv4.ip_forward = 0 # Controls source route verification net.ipv4.conf.default.rp_filter = 1 # Do not accept source routing net.ipv4.conf.default.accept_source_route = 0 # Controls the System Request debugging functionality of the kernel kernel.sysrq = 0 # Controls whether core dumps will append the PID to the core filename. # Useful for debugging multi-threaded applications. kernel.core_uses_pid = 1 # Controls the use of TCP syncookies net.ipv4.tcp_syncookies = 1 # Enable configuration of arp_ignore option net.ipv4.conf.all.arp_ignore = 1 # When an arp request is received on eth0, only respond if that address is # configured on eth0. In particular, do not respond if the address is # configured on lo net.ipv4.conf.eth0.arp_ignore = 1 # Ditto for eth1, add for all ARPing interfaces #net.ipv4.conf.eth1.arp_ignore = 1 # Enable configuration of arp_announce option net.ipv4.conf.all.arp_announce = 2 # When making an ARP request sent through eth0 Always use an address that # is configured on eth0 as the source address of the ARP request. If this # is not set, and packets are being sent out eth0 for an address that is on # lo, and an arp request is required, then the address on lo will be used. # As the source IP address of arp requests is entered into the ARP cache on # the destination, it has the effect of announcing this address. This is # not desirable in this case as adresses on lo on the real-servers should # be announced only by the linux-director. net.ipv4.conf.eth0.arp_announce = 2 # Ditto for eth1, add for all ARPing interfaces #net.ipv4.conf.eth1.arp_announce = 2 /etc/sysconfig/network-scripts/ifcfg-lo:0 DEVICE=lo:0 IPADDR=192.168.0.105 NETMASK=255.255.255.255 NETWORK=192.168.0.0 BROADCAST=192.168.0.255 ONBOOT=yes I don't think I skipped anything in the tutorial, though I had to do a bit of switching of packages to try and make the tutorial work on Fedora (since it was written for debian). But I think I have all the package requirements for Fedora. What other output can I include to help diagnose this? Any ideas on what's up?
Good suggestion, though I can't test it Ah, I didn't think of that. Unfortunately, I can't test it out now. I'm under a really right schedule and since I was stuck using heartbeat and ldirectord for load balancing, I decided to try a different solution. Since I'm using glassfish and my app is pure Java, HA-JDBC was easy to plugin and it handles the load-balancing and health checking quite well so far. If I end up going back to heartbeat and ldirectord, I'll definitely try mysqld. Thanks.
I got the same error Hre is my config file ldirectord.cf # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual=192.168.1.55:3306 service=mysql real=192.168.1.48:3306 gate real=192.168.1.49:3306 gate checktype=negotiate login="ld" passwd="password" database="lddb" request="SELECT * FROM connectioncheck" scheduler=wrr Seem like line 8 is not right service=mysql I tried service=mysqld still same error I tried to remove all blank spaces still same error I tried to move service=mysql under real=192.168.1.49:3306 gate now it complain about the real=192.168.1.48:3306 gate # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual=192.168.1.55:3306 real=192.168.1.48:3306 gate #line 8 error real=192.168.1.49:3306 gate service=mysql checktype=negotiate login="ld" passwd="password" database="lddb" request="SELECT * FROM connectioncheck" No matter what i put in always line 8? anyone got any solution to this? thanks scheduler=wrr
>Stopping ldirectord Error [] reading file /etc/ha.d/ldirectord.cf at line 8: >Unknown command service=mysql This error is due to formating, it took me some time to figure it out. The serivce= mysql is probably connected to /etc/services which is correct. If you have libmysqlclient15 or 14 installed, fixing right formating will do the trick like here: ---/etc/heartbeat/ldirectord.cf # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes #after virtual=... make TABS (or double spaces) in every line virtual = 10.0.2.10:3306 service = mysql real = 10.0.1.11:3306 gate real = 10.0.1.12:3306 gate checktype = negotiate login = "ldirector" passwd = "ldirector" database = "ldirectordb" request = "SELECT * FROM connectioncheck" scheduler = wrr -------------------------end of file--- Hope this helps. Peter
how to load balance with only 2pc I have 2PC -PC1, PC2 Is that possible i install the MYSQL in pc1,pc2 Node in pc1,pc2 cluster primary -pc1 secondary - pc2 How do i load balance with only 2 pc. How does this setup goes need kind advice,and steps.
2 nodes With two nodes, you can use other sort of load balance not with NDB cluster. Anyway i don't recomend this cluster if you need simple and easy installation and managenemnt. Cluster is very hard to tune, manage and backup. The setup i did works but it needs constatnt checking or reprograming few SQL clauses to use it well. I think you will be better of with any master-slave/master-master config with any kind of double connetion to mysql. Peter
