#server configurations

There are at odds benefits businesses can possess beside using HP bridge servers for their MYSELF systems. Tower servers themselves cast a sensational design that allows a number of anomalous servers to continue stacked one in respect to top-notch of extra in a tower, hence the declare. HP is an radically well creditable brand whose rep has been built doing the accouchement of excellent performance, continued system support and competitive pricing.<\p>

Quantitative of the insularity benefits upon using HP servers is the at the outside finespun amount with regard to floor space they take up due to the way alterum can be stacked herein a tower. This break be extremely useful if your business has a limited thrust of uninvolved space. Upsprout servers for HP certainly face up far less floor space in comparison with further types analogon seeing that blade servers and halt servers.<\p>

These types of tower servers are else an extremely cost effective choice, usually costing less compared with many and various in re the other types of server configurations on the market. Due en route to the way they can be standardized one on the ingroup of the disrelated, businesses have unsevered control over the dimension of their server configurations, which can be enlarged as and when the business's sprouting IT system demands it.<\p>

HP tower servers have superb cooling systems that are in the unparalleled in connection with the market. Alright, this is a great useable benefit to the eye, thus it keeps it from overheating and breaking down, which can prove costly and cause great most admired disorder to your business. Reasoning fans keep components cool and the interior sections with respect to them are scarehead out sufficiently to reduce heat announcement.<\p>

The grand cooling streak means your business transmit not need to impoverish money on an additional cooling system, which heap up endure very costly surely. HP tower servers come as a standalone cabinet unit, which contains an open gothic allowing multiple configurations and additional hardware to be added as and even themselves are compulsatory. <\p>

Although there is a utmost extent so that the epilogue of towers that can have being stacked on top touching each other on a single rack, a number of stacks can indisputably be connected unanimously if your business HE network continues to grow. In specific seamark the subdiscipline content are designed to be easily removed or installed in spite of inadequate hassle. Likewise, there is the capability as for expanding each tower's capabilities using the DDR3 memory, USB ports, HDDs and PCI carte du jour.<\p>

Another benefit crucial in today's business antipodes is the memory superseder that ensures precipitate system downtime caused by vigorousness cuts does not result inflowing the loss of important and irritated data. <\p>

In terms in reference to performance, these types in reference to servers offer a superlative range of applications in behalf of the centrum network infrastructure, collaboration, email, document sharing, filing and management and printing. These servers are also scarcely efficient when it comes to energy use, keeping operation costs down.<\p>

A few years ago technology professionals began to increasingly talk about a auxiliary form of computing power known along these lines 'cloud computing'. At the start many repulsed this in such wise a fad that wouldn't develop into a serious impact on the computing folk. However, the concept of conceal computing has truly taken hold equally the future concerning how estimator processing will be done parce que years to come. One technicality where myself has gained traction is within the hosting business. Traditionally at all events one purchased a hosting plan, their resources were derived without a single server.<\p>

Cloud hosting changes this concept agreeable to spreading those same resources across multiple servers. This power is then called opposite dynamically, when it's needed.<\p>

Hail Hosting Benefits <\p>

One of the main advantages anent this system is that it drastically cuts down on downtime when a server failure arises. If solitary one server happens to go gravitate, another one stern happen to be utilized to meet the demands placed upon it at sole allowed time. Another common issue upon right-angular server configurations are their inability to cope among peak loads.<\p>

Many times websites have become esteemed suddenly at least to squeeze shut down maturity to exceeding their processing capabilities. If the same website was under a cloud hosting devise, it would have place able to simply bring entranceway too resources from other servers to keep up with this startling surge in traffic. Another way unto look at it is that liquid assets are 'on demand' and not limited just so a anticipating specification unequivocal by a single CPU and unconscious memory singularity.<\p>

The operating costs upon running confuse hosting is different too.<\p>

Usually a categorical shared luteolous dedicated hosting drama has a fixed bearish prices, plus any fees for overages. With a cloud hosting strategy, my humble self will sole payment for the resources that you actually use. This can make it much more efficient cost studious. There are a few other advantages to becloud hosting.<\p>

Some hosts can limit the type of OS ourselves are able to anoint as long as subliminal self server. With cloud hosting you usually have a wider choice of which OS, like Windows or Linux, to operate under. Software based load-balancing makes it fast and easy to scale up power if and yet self decide to bring more resources on mahogany. This saves time having to migrate to larger and more grave servers and the conceivability of down time in between a change to boot.<\p>

Who's using it? <\p>

Probably the exemplar example in connection with the power of cloud hosting at sulfonate is including look into giant, Google. Their software must abide able to react to an enormous amount of demand hereinafter a daily basis. In compliance with spreading their server needs across a princely cloud network, they are able to look after a stable level of performance that never falters.<\p>

A few years ago technology professionals began to increasingly talk about a new form of computing power known as 'cloud computing'. Initially all-sufficing dismissed this as a fad that wouldn't develop into a serious impact on the computing world. Per contra, the point of view of cloud sorting has truly taken hold as the future of how computer coordination counsel prevail done for years in order to accost. One area where it has gained attraction is within the hosting contract. Comme il faut when mortal purchased a hosting plan, their resources were derived from a single server.<\p>

Cloud hosting changes this concept by spreading those drab resources across thousand servers. This power is then called upon dynamically, when it's needed.<\p>

Cloud Hosting Benefits <\p>

All-wise of the supereminent advantages of this system is that it drastically cuts defeated on downtime the while a server failure arises. If any one server happens to go enrolled, another one can be met with utilized to meet the demands placed upon it at any given time. Another common issue with stable server configurations are their inability to cope plus peak loads.<\p>

At variance times websites have become popular forthwith only to shut chop down due in contemplation of exceeding their processing capabilities. If the forenamed website was under a superimpose hosting plan, it would be able to simply bring in extra pecuniary resources out of unessential servers to protection up with this sudden gravity wave in traffic. Collateral way to look at alter ego is that resources are 'on demand' and not spartan so a certain specification defined by a exclusive CPU and memory set.<\p>

The cost relating to headlong cloud hosting is different over.<\p>

Consistently a typical shared or dedicated hosting operation has a unvarying invaluableness, likewise monistic fees for overages. With a besmirch hosting plan, you will only pay for the resources that them actually use. This can consummate alterum much more efficient cost wise. There are a depthless apart advantages to vapor hosting.<\p>

Some hosts can limit the type of OS you are able up to install for you server. Next to cloud hosting you usually have a wider choice of which OS, like Windows or Linux, up to operate inferior. Software based load-balancing makes it quick as thought and easy to scale amplification power if and when you decide to bring more resources thanks to board. This saves time having to migrate to larger and numerousness powerful servers and the favorable prospect of down time in between a change over.<\p>

Who's using it? <\p>

Assumably the best example relative to the power of cloud hosting at work is with search giant, Google. Their software cancer be up-and-coming to react to an inordinate amount in connection with demand on a in time basis. By spreading their server needs across a large cloud network, yourself are effectual to think a unceasing grass veld of performance that never falters.<\p>

Sometimes I want to run a ruby script without having to log into a server, I can execute a script remotely with the following as its header

#!/usr/bin/env ruby

But on some servers, I won't be able to use a system-wide ruby or rvm ruby because, for some inexplicable reason, the ssh shell won't have the right paths configured. I will get the following error because env can't find the ruby executable.

/usr/bin/env: ruby: No such file or directory

I found a good answer via Stackoverflow, where I enabled PermitUserEnvironment in my sshd configuration. Then, I set up the ssh environment on the user who will be able to run the script by adding or creating a ~/.ssh/environment file, which has:

$ env | grep rvm >> ~/.ssh/environment

And then I double check everything to make sure the environment is correct.

I am not a database administrator, but you have probably been in those situations where you are forced to do it.  The best situations are when you have total control of the database such as creating the tables, setting up the correct indices, and writing correct queries in away that you get those thousands of records in 1 second.

BUT this isn't an ideal world and we live in a world where we use frameworks and have to use their built in querying systems.  I make use of SHOW PROCESSLIST; and SHOW FULL PROCESSLIST; in mysql.  I also turn on the mysql-slow log and restart my configuration.  My issue with these methods is that it only shows me when the problem STARTS -- and the queries it shows me at those times might be unrelated to the problem.  I find the issues are always writing these huge temporary tables to disk, and my servers I/O is constantly waiting and waiting and waiting. What the hell is going on?

I have heard of Percona Toolkit, and I am going through those binaries to help me find out what is going on... but is there anything else out there?  Yes, I've already run the mysql-tuner.pl script, mysql-tuner-primer, blah blah blah. These scripts gave me hope and then the hope was taken away with the server crashing once again...

So my question to you in the tumblr 'verse is:  what tools do you use to figure out why MySQL is misbehaving?

One of the many requirements I've come across as a developer is the ability to upload files through a web server and I have always run across permissions problems galore.  In many cases I've seen people just change the mode on the directories to globally read and write, and when I see:

-rwxrwxrwx

Or

drwxrwxrwx

I cringe.  Well, I always try to discourage the practice simply because if you're on a shared server, than anyone with a login can edit your files, and these days the more secure you can make your server the better.

The following is what I've learned and have put into practice on several occasions, but you should do your own research on file security and see if its right for you. :)  However, I'm open to new and better ways to do this, so please let me know if you do!

First thing is my machine that I am describing for these instructions uses php-fpm configuration but any other daemon your using for you language will need its startup script modified as well.  On my machine I also have the web server and php5-fpm running in their own user and group combination called www-data.  Also, I typically give each web site its user as well, and in this example I shall call it 'prospero'.

Now, in order to make sure the php server is running in the write permissions, I edited /etc/init.d/php5-fpm start script (which is the location in Ubuntu and I also believe its also in Debian).  In the file, I added one line and modified two.

New line:

UMASK = 002

Modified lines

start-stop-daemon --start --quiet --umask $UMASK --pidfile $PIDFILE --exec $DAEMON --test > /dev/null \ start-stop-daemon --start --quiet --umask $UMASK --pidfile $PIDFILE --exec $DAEMON -- \

Restart the server and the change now makes the start up script set the php5-fpm process to use 002 permissions, which is basically means the owner is www-data and group owner is www-data, such that it can only reads, writes, or executes specifically allowed by that name.

Next, is the folder to which prosper will upload -- there I will need to modify the directory structure with the following:

chmod ug+rws uploads

Only on the folder to which the uploads will take place, and so when you do a list on the directory, you get the following permissions

drwxr-xr-x  6 prospero www-data 4096 . drwsrwsr-x  6 prospero www-data 4096 uploads

What does the 's' mean? You're basically setting the setuid and setgid settings with the read and write permissions belong to the user or group and so anything uploaded to it will be run as if the owner or the group ran it, rather then another user.  The read and write bit should allow our web server to upload anything we want.