Updating adm files server 2003. Installing ADMX Administrative Templates in Windows Server 2008 Group Policy.



Updating adm files server 2003

Updating adm files server 2003

Ipvsadm and Schedulers ipvsadm is the user code interface to LVS. The scheduler is the part of the ipvs kernel code which decides which realserver will get the next new connection. There are patches for ipvsadm stateless entry of ipvsadm commands Mar There appears to have been introduced a bug in the wrr code. Presumably this will be fixed sometime in the main code, and presumably older versions of ipvs still work but I don't know how far back you need to go, presumably to the 2.

Here are some postings on the matter and links to a patch. I use IPVS with direct routing and wrr scheduler. The smallest case where I can replicate the problem is the following: I have verified by tcpdump that no traffic is sent to realserver2 after it is removed from the virtual.

The ICMP "tcp port unreachable" is sent by the ipvs director. This appears to be a problem in the wrr scheduler. With wlc or rr it works as expected. The director is Fedora Core 3 with vanilla 2. Search the mailinglist archive for 'overload flag not resetting' which was my initial wrong diagnosis. Using ipvsadm You use ipvsadm from the command line or in rc files to setup: You use can also use ipvsadm to add services: This allows current connections to continue, untill they disconnect or expire, but will not allow new connections.

This allows deletion, followed shortly thereafter by adding back the service, to not affect established but quiescent connections. Memory Requirements On the director, the entries for each connection are stored in a hash table number of buckets set when compiling ipvsadm. Each entry takes bytes. Even large numbers of connections will use only a small amount of memory. Concurrent connection number is about Our main purpose for using LVS is to direct It is derived from http: This got me thinking: So you'd be able to say: In my mind it makes ipvsadm more of a "one stop shop" for the various settings - not only will it manage the virtual and real servers, but more of the underlying infrastructure too.

Ratz 08 Mar I tend to agree, however people that want to setup LVS do need to know Linux on the level of also understanding sysctrl variables and their meaning. I've always hoped that with having them in the ipvsadm man page, the problem would be solved. You still have to know what the options mean, correct?

I favour a different approach more: Make LVS really user friendly, in that you provide the users with a tool that takes away the low level configuration, just like in linux-ha or commercial load balancers. It's not so difficult to write this, it's just that someone has to sit down and do it. You still need to absolutely know the semantics of these settings. I think this was Ratz idea, but it seems like a good one to me, as it should allow a lot more flexibility in the user-space to kernel communication, which has always been a problem from the point of backwards compatibility.

So I have kind of been thinking of ipvsadm2 or ipvsadm-nl. I've attached my work actually the part I could find right now I know on some of my dozens of crashed Laptop harddisks there should be more in this email, so it doesn't get lost and you don't have to duplicate it.

This would also allow us to easily implement the missing features and enable us to move more towards netfilter-friendliness. Compile a version of ipvsadm that matches your ipvs Compile and install ipvsadm on the director using the supplied Makefile. You can optionally compile ipvsadm with popt libraries, which allows ipvsadm to handle more complicated arguments on the command line.

I'm using the dynamic libpopt and don't have this problem. Other possibilities are that the output of ipvsadm -L will have IP's that are clearly not IPs or not the IP's you put in and ports that are all wrong.

The ipvsadm from different kernel series 2. They don't know the maximum version which will be produced presumably some time in the future that they will run on. This protects you against the unlikely event of installing a new 2. The ipvsadm maintainers are aware of the problem.

Fixing it will break the current code and they're waiting for the next code revision which breaks backward compatibility. If you didn't even apply the kernel patches for ipvs, then ipvsadm will complain about missing modules and exit i. Other compile problems Ty Beede tybeede at metrolist dot net Ty Beede tybeede at metrolist dot net on a slackware 4.

The director then needs name resolution. If you don't have it, ipvsadm will take a long time upto a minute to return, as it waits for name resolution to timeout.

The only IPs that the director needs to resolve are of the realservers. This lookup is quicker than DNS and you won't need to open a route from the director to a nameserver. RR and LC schedulers On receiving a connect request from a client, the director assigns a realserver to the client based on a "schedule".

The scheduler type is set with ipvsadm. The schedulers available are round robin rr , weighted round robin wrr - new connections are assigned to each realserver in turn least connected lc , weighted least connection wlc - new connections go to realserver with the least number of connections. This is not neccessarily the least busy realserver, but is a step in that direction. Willy Tarreau in http: The SH scheduler has not been much used in LVS, possibly because no-one knew the syntax for a long time and couldn't get it to work.

Most shopping cart type servers are using persistence, which has many undesirable side effects. The original schedulers are rr, and lc and their weighted versions. Any of these will do for a test setup. In particular, round robin will cycle connections to each realserver in turn, allowing you to check that all realservers are functioning in the LVS. The rr,wrr,lc,wlc schedulers should all work similarly when the director is directing identical realservers with identical services.

The lc scheduler will better handle situations where machines are brought down and up again see thundering herd problem. If the realservers are offering different services and some have clients connected for a long time while others are connected for a short time, or some are compute bound, while others are network bound, then none of the schedulers will do a good job of distributing the load between the realservers.

LVS doesn't have any load monitoring of the realservers. Figuring out a way of doing this that will work for a range of different types of services isn't simple see load and failure monitoring. This is academia for the rest of the world. You will need to setup the routing for the VIP to match the netmask. For more details, see the chapters for each forwarding method. Horms 12 Aug The real story is that the netmask works a little differently on lo to other interfaces.

This is how So if you add But if you add the same thing to lo then it will answer So you need to use To clarify - ifconfig eth0: On windows you can get away with But we've found that For normal LVS services eg ftp, http , the content offered by each realserver is the same and it doesn't matter which realserver the client is connected to.

For a web cache, after the first fetch has been made, the web caches have different content. As more pages are fetched, the contents of the web caches will diverge. Since the web caches will be setup as peers, they can communicate by ICP internet caching protocol to find the cache s with the required page.

This is faster than fetching the page from the original webserver. However, it would be better after the first fetch of a page from http: The original method for handling this was to make connections to the realservers persistent, so that all fetches from a client went to the same realserver.

The -dh destination hash algorythm makes a hash from the target IP and all requests to that IP will be sent to the same realserver. This means that content from a URL will not be retrieved multiple times from the remote server.

The realservers eg squids in this case will each be retreiving content from different URLs. I think some examples to use those two schedulers. Make sure that the cache servers are added in the two load balancers in the same order Diego Woitasen 12 Aug The scheduling algorithms that use dest IP for selecting the realserver to use like DH, LBLC, LBLCR is only aplicable to transparent proxy, this being the only aplication where the dest ip could be variable.

Wensong Zhang wensong at linux-vs dot org 12 Aug Yes, you are almost right. DH can be used for transparent proxy cluster and can be used in other clusters needing static mapping. Note Here's follows a set of exchanges between a Chinese person and Wensong, that were in English, that I didn't follow at all. Apparently it was clear to Wensong. In lblc the server has overloaded and lvs use wlc and allocate a server in half load of the server, Allocate the weighted least-connection server to IP address.

Is this means after allocation for ip address, it will not return to past server? No, it will not in most cases.

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Updating adm files server 2003

Ipvsadm and Schedulers ipvsadm is the user code interface to LVS. The scheduler is the part of the ipvs kernel code which decides which realserver will get the next new connection. There are patches for ipvsadm stateless entry of ipvsadm commands Mar There appears to have been introduced a bug in the wrr code.

Presumably this will be fixed sometime in the main code, and presumably older versions of ipvs still work but I don't know how far back you need to go, presumably to the 2. Here are some postings on the matter and links to a patch. I use IPVS with direct routing and wrr scheduler. The smallest case where I can replicate the problem is the following: I have verified by tcpdump that no traffic is sent to realserver2 after it is removed from the virtual.

The ICMP "tcp port unreachable" is sent by the ipvs director. This appears to be a problem in the wrr scheduler. With wlc or rr it works as expected. The director is Fedora Core 3 with vanilla 2. Search the mailinglist archive for 'overload flag not resetting' which was my initial wrong diagnosis.

Using ipvsadm You use ipvsadm from the command line or in rc files to setup: You use can also use ipvsadm to add services: This allows current connections to continue, untill they disconnect or expire, but will not allow new connections.

This allows deletion, followed shortly thereafter by adding back the service, to not affect established but quiescent connections. Memory Requirements On the director, the entries for each connection are stored in a hash table number of buckets set when compiling ipvsadm. Each entry takes bytes. Even large numbers of connections will use only a small amount of memory. Concurrent connection number is about Our main purpose for using LVS is to direct It is derived from http: This got me thinking: So you'd be able to say: In my mind it makes ipvsadm more of a "one stop shop" for the various settings - not only will it manage the virtual and real servers, but more of the underlying infrastructure too.

Ratz 08 Mar I tend to agree, however people that want to setup LVS do need to know Linux on the level of also understanding sysctrl variables and their meaning. I've always hoped that with having them in the ipvsadm man page, the problem would be solved. You still have to know what the options mean, correct? I favour a different approach more: Make LVS really user friendly, in that you provide the users with a tool that takes away the low level configuration, just like in linux-ha or commercial load balancers.

It's not so difficult to write this, it's just that someone has to sit down and do it. You still need to absolutely know the semantics of these settings. I think this was Ratz idea, but it seems like a good one to me, as it should allow a lot more flexibility in the user-space to kernel communication, which has always been a problem from the point of backwards compatibility.

So I have kind of been thinking of ipvsadm2 or ipvsadm-nl. I've attached my work actually the part I could find right now I know on some of my dozens of crashed Laptop harddisks there should be more in this email, so it doesn't get lost and you don't have to duplicate it. This would also allow us to easily implement the missing features and enable us to move more towards netfilter-friendliness.

Compile a version of ipvsadm that matches your ipvs Compile and install ipvsadm on the director using the supplied Makefile. You can optionally compile ipvsadm with popt libraries, which allows ipvsadm to handle more complicated arguments on the command line. I'm using the dynamic libpopt and don't have this problem. Other possibilities are that the output of ipvsadm -L will have IP's that are clearly not IPs or not the IP's you put in and ports that are all wrong.

The ipvsadm from different kernel series 2. They don't know the maximum version which will be produced presumably some time in the future that they will run on. This protects you against the unlikely event of installing a new 2. The ipvsadm maintainers are aware of the problem.

Fixing it will break the current code and they're waiting for the next code revision which breaks backward compatibility. If you didn't even apply the kernel patches for ipvs, then ipvsadm will complain about missing modules and exit i. Other compile problems Ty Beede tybeede at metrolist dot net Ty Beede tybeede at metrolist dot net on a slackware 4. The director then needs name resolution. If you don't have it, ipvsadm will take a long time upto a minute to return, as it waits for name resolution to timeout.

The only IPs that the director needs to resolve are of the realservers. This lookup is quicker than DNS and you won't need to open a route from the director to a nameserver. RR and LC schedulers On receiving a connect request from a client, the director assigns a realserver to the client based on a "schedule".

The scheduler type is set with ipvsadm. The schedulers available are round robin rr , weighted round robin wrr - new connections are assigned to each realserver in turn least connected lc , weighted least connection wlc - new connections go to realserver with the least number of connections.

This is not neccessarily the least busy realserver, but is a step in that direction. Willy Tarreau in http: The SH scheduler has not been much used in LVS, possibly because no-one knew the syntax for a long time and couldn't get it to work. Most shopping cart type servers are using persistence, which has many undesirable side effects.

The original schedulers are rr, and lc and their weighted versions. Any of these will do for a test setup. In particular, round robin will cycle connections to each realserver in turn, allowing you to check that all realservers are functioning in the LVS.

The rr,wrr,lc,wlc schedulers should all work similarly when the director is directing identical realservers with identical services. The lc scheduler will better handle situations where machines are brought down and up again see thundering herd problem. If the realservers are offering different services and some have clients connected for a long time while others are connected for a short time, or some are compute bound, while others are network bound, then none of the schedulers will do a good job of distributing the load between the realservers.

LVS doesn't have any load monitoring of the realservers. Figuring out a way of doing this that will work for a range of different types of services isn't simple see load and failure monitoring. This is academia for the rest of the world.

You will need to setup the routing for the VIP to match the netmask. For more details, see the chapters for each forwarding method. Horms 12 Aug The real story is that the netmask works a little differently on lo to other interfaces. This is how So if you add But if you add the same thing to lo then it will answer So you need to use To clarify - ifconfig eth0: On windows you can get away with But we've found that For normal LVS services eg ftp, http , the content offered by each realserver is the same and it doesn't matter which realserver the client is connected to.

For a web cache, after the first fetch has been made, the web caches have different content. As more pages are fetched, the contents of the web caches will diverge. Since the web caches will be setup as peers, they can communicate by ICP internet caching protocol to find the cache s with the required page. This is faster than fetching the page from the original webserver.

However, it would be better after the first fetch of a page from http: The original method for handling this was to make connections to the realservers persistent, so that all fetches from a client went to the same realserver. The -dh destination hash algorythm makes a hash from the target IP and all requests to that IP will be sent to the same realserver. This means that content from a URL will not be retrieved multiple times from the remote server. The realservers eg squids in this case will each be retreiving content from different URLs.

I think some examples to use those two schedulers. Make sure that the cache servers are added in the two load balancers in the same order Diego Woitasen 12 Aug The scheduling algorithms that use dest IP for selecting the realserver to use like DH, LBLC, LBLCR is only aplicable to transparent proxy, this being the only aplication where the dest ip could be variable.

Wensong Zhang wensong at linux-vs dot org 12 Aug Yes, you are almost right. DH can be used for transparent proxy cluster and can be used in other clusters needing static mapping. Note Here's follows a set of exchanges between a Chinese person and Wensong, that were in English, that I didn't follow at all. Apparently it was clear to Wensong. In lblc the server has overloaded and lvs use wlc and allocate a server in half load of the server, Allocate the weighted least-connection server to IP address.

Is this means after allocation for ip address, it will not return to past server? No, it will not in most cases.

Updating adm files server 2003

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2 Comments

  1. The ipvsadm from different kernel series 2. The packet is accepted by the hook but altered mark changed.

  2. This protects you against the unlikely event of installing a new 2. I muddled my way through it, but I thought I'd share my experience in case it can save others some trouble.

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