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6

There are a few things you can do to make your life easier. The first is to fully understand the Red Hat release life cycle. One thing I suggest to people using Satellite is to keep a copy of the available channels in a local file: # satellite-sync -l > channel_list This will save you the hassle of having to wait for satellite-sync to communicate ...


5

You pay Red Hat for Extended Update Support. This is the only supported way to avoid updating to the latest service pack, and is subject to availability. It's not offered for all point releases.


4

For monitoring you can use Munin or Cacti and for management you could use Puppet. If it absolutely has to be web based, you can install ebox but it doesn't manage multiple servers (AFAIK).


4

You should generally use a TCP stack that implements proper Window scaling. But of course you are right that your window size needs to mach that bandwidth-delay-product (BDP). In case you have a varying BDP you can set the window size to something you'd expect as a common "worst" case. Interestingly enough most connections don't suffer from too much if the ...


3

Message Moderation One probably non-ideal solution is to use a transport rule to forward messages over a certain size to either the sender's manager or a designated mailbox (on the ship's Exchange server) for moderation. This way if they are at sea, large messages can be essentially queued up in another mailbox. When the ship arrives at port, the manager ...


3

I was very close to doing a similar thing with $dayjob. Most colocation centres - good ones, anyway, do rent roof-space, although these are usually used for satellite backhaul. I can't see why they'd mind putting TV satellite receiving dishes on their aerial space, provided that you're paying for it ;)


3

We do not get new features that can break applications I think this is a canard. Update all in a staging environment and run regression. I'd be very surprised if you uncovered an update in the RHEL releases that broke your application.


3

If you want security updates, you must do either one of two things: Always update to the latest service pack, currently 5.9. RHEL subscriptions normally receive security and bug fix updates against the latest minor release only. However, Red Hat does offer backporting: Purchase Extended Update Support for the specific minor release you want to remain on. ...


2

I don't believe there is a way to use package groups with Satellite - at least I've never found one - but you can get the same effect by crating a package that has no payload but does have dependencies. Simply list all the packages you wish to install via the proposed yum groupinstall command in the Requires: section and it will pull in all those packages ...


2

The short answer is: you can't use the kickstart to immediately be up-to-date, you need to include a yum update as port of the post-install. The kickstart tree is to be accessible for systems that are yet to be deployed and have not been registered yet, in other words it is publicly accessible, where from the commercial point of view the up-to-date channels ...


2

If my math is right, 50MB of usage over a 4 hour period works out to about 27.8Kbps of usage, which is in the general range for an RDP session (albeit a little on the low side in my opinion). My suggestion would be to find out what the overage penalties\fees are first, then if you have to use it make sure to set the RDP client Experience settings to Modem ...


2

I would guess the problem is that the mail is being retrieved via pop3 but not being deleted from the server once it's downloaded. Every time outlook express connects, it has to download the index of the mailbox before it can know what messages should be downloaded. If old messages are never deleted, then the index will only grow. Outlook express has an ...


2

I'd say you need to contact the local providers, like Golden Telecom or masterhost.ru I'm no expert on the market there, but afaik, it also highly depends on the area you're looking to communicate with, since service providers vary, and Russia is VERY large.


2

For a project I was involved with in Mosul Iraq we used Horizon Satellite Services. It was only a 512kbs/512kbs connection, but I am almost positive they offer up to 2MB service. The connection, though horribly latent (who would have guessed), was very stable. However they are based out of Dubai, but have some sort of presence in Germany. Hope this helps ...


2

This is totally academic because nobody runs TCP over satellite connections. I don't know a single satellite provider that does this. They all run satellite-specific protocols over the satellite and place the TCP endpoint at the ground station. When a machine on the network sends a TCP SYN packet to the satellite terminal, the satellite terminal sends a TCP ...


2

Try to take a look to the new features of "Message Throttling" introduced with Exchange 2010 SP1. It could be very helpful for your use case. http://technet.microsoft.com/en-us/library/bb232205(v=exchg.141).aspx


2

To solve the problem the way you have requested, you could write your own Transport Agent using the Microsoft Exchange Transport Agent SDK. Transport Agents are event based so Exchange will call a function in your library when a message is received. Your library can then do something like hold the message. If you don't have the skills in-house to do this, ...


1

You're right, you need to use the old "rhnplugin" to talk to RHN Classic or RHN Satellite. The "Unable to read consumer identity" message is harmless, it's just the "subscription-manager" plugin saying the system isn't registered via RHSM. You can disable the "subscription-manager" plugin on your clients if you like.


1

Do you have the 5.7 distribution as a kickstartable tree? If so, you can create a new kickstart profile for your RHEL5 channel, using the 5.7 distribution, and then make sure you don't update the box in %post OR have you looked into using the spacewalk-create-channel program? http://blog-zokahn.rhcloud.com/?p=219 Should be something like this: ...


1

For the sake of convenience there are bandwidth-delay product calculators available - one such calculator is here. As to large windows causing issues in the event of packet loss - that's pretty much exactly why TCP windowing is variable. Upon packet loss the window size will decrease, allowing for less data in flight and a consequent reduction in ...


1

An answer to another question pointed me to app-dater which claims to support Debian, OpenSuSE and CentOS. I haven't tried it yet but it looks like a good alternative when it comes to keeping packages up-to-date. It has a cli UI only though.


1

As to why your smarthost configuration didn't work - do you have the premium version of Google Apps? You can't use the free version as an outbound relay. Attempting to do so might appear as a "user not found" because the acceptable range of addresses is limited to the domains that Google Apps hosts. ...


1

I suggest that you get this dual tuner DVB-S2 card, and that you use VLC for receiving and streaming the channels. If your office network supports IGMP snooping or if the majority of the clients will be using the streams I suggest that you use multicast streaming as well. It will minimize the hardware spec on the server and the combined load on the network. ...


1

A UFTP client sends packets unicast back to the server's IP address. The fact that the incoming packets are sent to a multicast address shouldn't change that. If you can't send unicast from the clients back to the server, perhaps you can set up routes on the client side so that the return traffic takes a route other than satellite. If there's no way at ...


1

The way I do this is to create clone channels, and then only clone the errata I want from the upstream channel into the clone. It take a bit of effort to make sur you don't clone an errata that has a dependency on an errata you don't want, but it effectively pins package versions at whatever level you stop cloning errata.


1

When running the spacewalk-create-channel command, you get a static channel with packages based on the options you provide. You can always then manually clone or push in packages and security errata from other channels to it, but then you might end up having a hard time keeping track of what's in the channel... Does that mean a created channels with the ...


1

Short answer: yes. Longer answer: you'll need to look in to to the Satellite API. The documentation available with Satellite is good for a very basic query, but you'll quickly get in to queries that (IMHO) aren't as well documented. At a high level, what you'll end up doing is querying Satellite for a list of all registered systems, then using that list to ...



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