02-06-2011
Unix/Linux System Administrator - Study Advice
Hello all,
I really hope that this is the right Forum to post this kind of a question...
I have been working in the IT support industry for nearly 3 years now. I started of providing end-user support. So enough to say that I provided my fair share of "have you tried turning it off and on" solutions and did more password resets then is medically healthy for one... Anyway, to make a long story short I am now supporting HP-UX and Linux (SUSE and Red Hat) in mostly business critical environments for a living.
Although I am very happy with my current job I do of course sometimes wonder what my next position might be... And this is exactly where I need some help with. The logical next step (in my opinion at least) is to become a (Junior) System Administrator (which has been pretty much my goal when I started 3 years ago). However, providing support for Unix/Linux issues is obviously quite different from actually managing a couple of these servers. I must say that over the years I have become quite good at researching issues and documenting solutions... But at the same time I do not feel overly confident about mu administration skills.
So what I really like to know (hopefully from some experienced Unix/Linux system administrators) is how to proceed to the next level. How do I move from a support job into a administrator job? Or maybe even better, how did you manage to get there?
What I am especially interested in is:
- what certificate/course would you recommend me taking?
- what topics should I focus on?
- what else do you recommend me doing to make the transition as smooth as possible?
I was thinking to do the following:
- try to get the RHCSA (or possibly RHCE) certification under my belt
- focus on shell scripting (maybe Perl)
What are your thoughts? Keep in mind that I am currently living and working in Europe (not sure if that makes a difference?).
Thanks in advance for your time and suggestions!
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LEARN ABOUT MOJAVE
dbix::class::storage::dbi::replicated::balancer
DBIx::Class::Storage::DBI::Replicated::Balancer(3) User Contributed Perl Documentation DBIx::Class::Storage::DBI::Replicated::Balancer(3)
NAME
DBIx::Class::Storage::DBI::Replicated::Balancer - A Software Load Balancer
SYNOPSIS
This role is used internally by DBIx::Class::Storage::DBI::Replicated.
DESCRIPTION
Given a pool (DBIx::Class::Storage::DBI::Replicated::Pool) of replicated database's (DBIx::Class::Storage::DBI::Replicated::Replicant),
defines a method by which query load can be spread out across each replicant in the pool.
ATTRIBUTES
This class defines the following attributes.
auto_validate_every ($seconds)
If auto_validate has some sort of value, run "validate_replicants" in DBIx::Class::Storage::DBI::Replicated::Pool every $seconds. Be
careful with this, because if you set it to 0 you will end up validating every query.
master
The DBIx::Class::Storage::DBI object that is the master database all the replicants are trying to follow. The balancer needs to know it
since it's the ultimate fallback.
pool
The DBIx::Class::Storage::DBI::Replicated::Pool object that we are trying to balance.
current_replicant
Replicant storages (slaves) handle all read only traffic. The assumption is that your database will become readbound well before it
becomes write bound and that being able to spread your read only traffic around to multiple databases is going to help you to scale
traffic.
This attribute returns the next slave to handle a read request. Your "pool" attribute has methods to help you shuffle through all the
available replicants via its balancer object.
METHODS
This class defines the following methods.
_build_current_replicant
Lazy builder for the "current_replicant_storage" attribute.
next_storage
This method should be defined in the class which consumes this role.
Given a pool object, return the next replicant that will serve queries. The default behavior is to grab the first replicant it finds but
you can write your own subclasses of DBIx::Class::Storage::DBI::Replicated::Balancer to support other balance systems.
This returns from the pool of active replicants. If there are no active replicants, then you should have it return the master as an
ultimate fallback.
around: next_storage
Advice on next storage to add the autovalidation. We have this broken out so that it's easier to break out the auto validation into a
role.
This also returns the master in the case that none of the replicants are active or just forgot to create them :)
increment_storage
Rolls the Storage to whatever is next in the queue, as defined by the Balancer.
around: select
Advice on the select attribute. Each time we use a replicant we need to change it via the storage pool algorithm. That way we are
spreading the load evenly (hopefully) across existing capacity.
around: select_single
Advice on the select_single attribute. Each time we use a replicant we need to change it via the storage pool algorithm. That way we are
spreading the load evenly (hopefully) across existing capacity.
before: columns_info_for
Advice on the current_replicant_storage attribute. Each time we use a replicant we need to change it via the storage pool algorithm. That
way we are spreading the load evenly (hopefully) across existing capacity.
_get_forced_pool ($name)
Given an identifier, find the most correct storage object to handle the query.
AUTHOR
John Napiorkowski <jjnapiork@cpan.org>
LICENSE
You may distribute this code under the same terms as Perl itself.
perl v5.18.2 2014-01-05 DBIx::Class::Storage::DBI::Replicated::Balancer(3)