Hello, I just finished setting up the How To's for Falkos High Availability Apache Cluster and High Availibility MYSQL Cluster. I did this on Debian Etch servers. So I could see that the differneces in the setups were the contents of the ldirectord.cf file. This is the file that controls the virtual server. My question is: Is there a way to combine the two virtaul servers (apache and mysql). I mean each How To tells us how to cluster one service i.e MYSQL or Apache. What I would like to do is cluster MYSQL and Apache on the same servers. Does the ldirectord.cf allow for more than one service to be virtualized? I would go ahead and try this but I dont want to blow up what took me a few days to set up. I am a complete noob to LINUX and so I am doing all this slowly and trying to learn as much as possible. Thank you for your help and especially to Falko for his great documentation, Pete Granada Spain
OK after a while I got brave and changed the ldirectord.cf file myself. I included the two services (MYSQL & Apache) like so: Code: checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual=192.168.0.105:80 real=192.168.0.101:80 gate real=192.168.0.102:80 gate fallback=127.0.0.1:80 gate service=http request="ldirector.html" receive="Elvis has left the building!" scheduler=rr protocol=tcp checktype=negotiate # Global Directives checktimeout=10 checkinterval=2 autoreload=no logfile="local0" quiescent=yes virtual = 192.168.0.105:3306 service = mysql real = 192.168.0.101:3306 gate real = 192.168.0.102:3306 gate checktype = negotiate login = "ldirector" passwd = "ldirectorpassword" database = "ldirectordb" request = "SELECT * FROM connectioncheck" scheduler = wrr I then rebooted the two load balancers and issued the following command: Code: bubba:/home/pete# ipvsadm -L -n IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 192.168.0.105:80 rr -> 192.168.0.101:80 Route 1 0 0 -> 192.168.0.102:80 Route 1 0 0 TCP 192.168.0.105:3306 wrr -> 192.168.0.101:3306 Route 1 0 0 -> 192.168.0.102:3306 Route 1 0 0 bubba:/home/pete# Seeing this was what I wanted. I was able to access both services via the virtual address 192.168.0.105. I added rsync for Apache using this How To: http://www.howtoforge.com/mirroring_with_rsync This gave me all the functionality I was looking for: 1. Replicated MYSQL databases 2. Mirrored Apapche Servers 3. Loadbalancing of services 4. Fault-tolerence of services My next question would be how can I take advantage of this technology for my mail server which really is the most important service I have. Thanks again to anyone who can help, Pete Granada Spain
Production ready?? Hello Again, Having finished the How To's High Availability Apache Cluster , High Availibility MYSQL Cluster, and Mirroring with Rsync I am wondering if I can go ahead and put this into a production enviroment? The reason I am unsure is the version for MYSQL-MAX (now called MAXDB)in the How To is 5.0 and the currrent version is 7.5. I am unaware of how older versions of software are updated in the LINUX world. Are older versions safe to use? So simply put would you feel comfortable running mysql-max 5.0 on a publically available server? Another reason we are reluctant to use 7.5 is that it requires X and that could lead to security issues. Thanks again, P.
MaxDB != MySQL. Take a look here: http://en.wikipedia.org/wiki/MaxDB The latest stable MySQL version is 5.0.45, AFAIK.
I have two questions regarding this tutorial. 1. Can I configure the cluster using a clean lamp install, or do I need to follow everything step-by-step? 2. Can I omit the second load-balancer? Thank you, Chris
I recommend to do it step-by-step, but you can also start with a clean LAMP system. Yes, but then you lose high-availability because the load balancer that is left becomes a single point of failure.
Thank you, Falko. I might just have to see what I can do about getting just one more server. I'll probably wipe the clean LAMP install of Ubuntu I have on the two MySQL nodes and do it step-by-step like you said. Thanks! Chris
I am to the point of install UltraMonkey, but I am having the following problem: Code: cybernetics@LoadBalancer1:/var/lib/mysql-cluster$ sudo apt-get install ultramonkey libdbi-perl libdbd-mysql-perl libmysqlclient14-dev Reading package lists... Done Building dependency tree Reading state information... Done Package libmysqlclient14-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: libalps-heap1-dev E: Package libmysqlclient14-dev has no installation candidate cybernetics@LoadBalancer1:/var/lib/mysql-cluster$ Should I install libalps-heap1-dev instead, or use libmysqlclient15-dev? Thank you, Chris
I went ahead and installed libmysqlclient15-dev. Now, I tried to bring up lo:0, but here's what happened: Code: cybernetics@Automation:/var/lib/mysql-cluster$ sudo ifup lo:0 SIOCSIFFLAGS: Cannot assign requested address lo:0 is up, so can I just ignore the error message? Thank you, Chris
...and this. lol Code: cybernetics@LoadBalancer1:/etc/ha.d$ sudo /etc/init.d/ldirectord stop /etc/init.d/ldirectord: 36: Syntax error: "}" unexpected (expecting "fi") cybernetics@LoadBalancer1:/etc/ha.d$
What's in /etc/init.d/ldirectord? Can you double-check that your setup is as close as possible to the one in the tutorial? I'd install libmysqlclient15-dev.
