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When learn­ing about vir­tu­al­i­sa­tion tech­nolo­gies, what at­tracted me most were con­tain­ers be­cause of their easy de­ploy­ment. Con­tain­ers (also known as light­weight vir­tu­al­i­sa­tion) are tools for iso­la­tion, which use names­paces for the pur­pose. They are a bet­ter sand­box­ing util­ity, be­cause they gen­er­ally use more then one names­pace and are more fo­cused on cre­at­ing a whole vir­tual sys­tem in­stance rather than iso­lat­ing a sin­gle process.

Con­tain­ers are not a new tech­nol­ogy. They have been in UNIX and Linux for decades but due to their in­creas­ing use in SaaS and PaaS, they have be­come a hot topic since they pro­vide the most se­cure en­vi­ron­ment to deliver and use these ser­vices. They are called light­weight vir­tu­al­i­sa­tion be­cause they pro­vide process level iso­la­tion, which means they de­pend on the Linux ker­nel. Hence, only those in­stances can be cre­ated which use the same base ker­nel. There are lots of con­tain­ers avail­able for Linux that have gained pop­u­lar­ity over the past few years.

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