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Auto-Scaling ÀÇ Termination Process - default ½Ã

 
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¿Ã¸®±â¿Ã·ÁÁü: 2015.3.06 ±Ý, 9:30 am    ÁÖÁ¦: Auto-Scaling ÀÇ Termination Process - default ½Ã Àοë°ú ÇÔ²² ´äº¯

¾Æ¸¶Á¸ÀÇ Auto-Scaling ±â´ÉÀ̶õ °ÍÀº Àß ¾Æ½Ç°Ì´Ï´Ù.

±âº»ÀûÀ¸·Î´Â Cloud Watch ÀÇ Metric À» ±âÁØÀ¸·Î »ç¿ë·®(ÀÓ°èÄ¡)¿¡ µû¶ó ÀÚµ¿À¸·Î Scale in/out(¼­¹öµéÀ» ÁÙ¿´´Ù ´Ã·È´Ù) ÇØÁÖ´Â °ÍÀÌÁÒ.

Scale out(´Ã¾î³µ´Ù°¡) ÀÌ µÇ¾ú´Ù°¡ Scale in(ÁÙ¾îµé¶§) ÇÒ¶§, ¼­¹ö¸¦ ¾î¶² ±âÁØÀ¸·Î ÇÏ¿© Termination(Á¾·á - ¾ø¾Ö±â) ÇÒ±î¿ä?

¿ì¼±Àº Default ¼³Á¤½Ã Termination ÇÏ´Â °úÁ¤À» º¸°Ú½À´Ï´Ù. ÀÌ´Â ´Ã»ó ±×·¸µí ¾Æ¸¶Á¸ ¹®¼­¿¡ Àß ³ª¿Í ÀÖ½À´Ï´Ù. (http://docs.aws.amazon.com/AutoScaling/latest/DeveloperGuide/AutoScalingBehavior.InstanceTermination.html#default-termination-policy)

Àú´Â ¿µ¾î¶ó Àб⠾î·Á¿ì½Å ºÐÀ» À§ÇØ Çѱ۷ΠÀá½Ã Á¤¸®ÇØ µå¸®´Â °ÅÁÒ. ¾Æ·¡¿¡ ÀÚ¼¼È÷ Àû±ä Çߴµ¥, °£·«ÇÏ°Ô ´Ù½Ã Çѱ۷θ¸ Á¤¸® Çϸé

1. AZ ¼±ÅÃ
- Multi AZ ÀÏ °æ¿ì¿¡ ÀνºÅϽº°¡ °¡Àå ¸¹Àº AZ¸¦ ¼±ÅÃÇÏ°í, ÀνºÅϽºÀÇ ¼ýÀÚ°¡ °°´Ù¸é Random ÇÏ°Ô ¼±Åà µË´Ï´Ù.
- Multi AZ °¡ ¾Æ´Ò°æ¿ì¿¡´Â ±× AZ¿¡¼­ µ¿ÀÛ ÇÕ´Ï´Ù.

2. °¡Àå ¿À·¡µÈ Launch Configure ¸¦ »ç¿ëÇÏ´Â ÀνºÅϽº¸¦ Á¾·á ÇÕ´Ï´Ù.

3. °¡Àå ¿À·¡µÈ Launch Configure ¸¦ »ç¿ëÇÏ´Â ÀνºÅϽº°¡ ´Ù¼öÀÏ °æ¿ì¿¡´Â ºñ¿ë ¹ß»ýÀÌ ±ÙÁ¢ÇÑ ÀνºÅϽº(ºñ¿ëÀ» ÃÖ¼ÒÈ­ÇÔ - »ç¿ëÀÇ ±Ø´ëÈ­) ¸¦ Á¾·á ÇÕ´Ï´Ù.

4. ºñ¿ë ¹ß»ýÀÌ ±ÙÁ¢ÇÑ ÀνºÅϽº°¡ ´Ù¼ö(Multiple) ÀÖ´Ù¸é, ÀÚµ¿(Random)À¸·Î ÀνºÅϽº ¼±ÅÃÇÏ¿© Á¾·á(termination)

¼ø¼­°¡ À̸® µÇ´Â°ÅÁÒ. AZ ¼±Åà --> ¿À·¡µÈ Launch Confiugre »ç¿ë ÀνºÅϽº --> ºñ¿ë ¹ß»ýÀÌ µµ·¡ÇÑ ÀνºÅϽº --> ´Ù¼öÀÏ °æ¿ì Random ÇÏ°Ô Á¾·á

¹°·Ð, ÀÌ °úÁ¤À» »ç¿ëÀÚ°¡ º¯°æÇÒ ¼ö ÀÖ½À´Ï´Ù.


Àοë:

1. Auto Scaling determines whether there are instances in multiple Availability Zones. If so, it selects the Availability Zone with the most instances. If there is more than one Availability Zone with this number of instances, Auto Scaling selects one of these Availability Zones at random.

--> a. Á¾·á(termination) ÇÒ AZ ¼±ÅÂ.
- Multi-AZ °¡ ¾Æ´Ï¸é, ÇϳªÀÇ AZ ±âº»À¸·Î ¼±ÅÃ
- Multi-AZ ¶ó¸é,
: ÀνºÅϽº ¼ö°¡ °¡Àå ¸¹Àº(most) AZ ¼±ÅÃ
: ÀνºÅϽº ¼ö°¡ °°´Ù¸é ÀÚµ¿(Random) AZ ¼±ÅÃ

2. Auto Scaling determines which instances in the selected Availability Zone use the oldest launch configuration. If there is one such instance, it terminates it.

--> b. °¡Àå ¿À·¡µÈ launch Configuration À» »ç¿ëÇÏ´Â ÀνºÅϽº¸¦ Á¾·á(Termination.)

3. If there are multiple instances that use the oldest launch configuration, Auto Scaling determines which instances are closest to the next billing hour. (This helps you maximize the use of your EC2 instances while minimizing the number of hours you are billed for Amazon EC2 usage.) If there is one such instance, Auto Scaling terminates it.

--> c. °¡Àå ¿À·¡µÊ Launch Configuration À» »ç¿ëÇÏ´Â ÀνºÅϽº°¡ ´Ù¼ö(Multiple) ÀÖ´Ù¸é, ºñ¿ë ¹ß»ýÀÌ ±ÙÁ¢ÇÑ ÀνºÅϽº(ºñ¿ëÀ» ÃÖ¼ÒÈ­ÇÔ - »ç¿ëÀÇ ±Ø´ëÈ­) ¸¦ Á¾·á(Termination)


4. If there is more than one instance closest to the next billing hour, Auto Scaling selects one of these instances at random.

--> ºñ¿ë ¹ß»ýÀÌ ±ÙÁ¢ÇÑ ÀνºÅϽº°¡ ´Ù¼ö(Multiple) ÀÖ´Ù¸é, ÀÚµ¿(Random)À¸·Î ÀνºÅϽº ¼±ÅÃÇÏ¿© Á¾·á(termination)


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