amazon web services - How to scale out Tomcat on AWS EC2 instance? -

-

there number of questions on auto scaling. none of talks scaling out software stack installed on these servers. aws auto scaling scales out resources. not software on it. in case looking forward scale out tomcat server (and apache httpd server) installed on first instance part of new instance aws scaling service creates.

i followed regular process establish scaling application on amazon web services ec2 instances.

  1. created snapshot existing instance exact configurations of running instance - success
  2. created ami above snapshot - success
  3. created auto scaling group , launch configuration - success
  4. scaling policy create new instance upon cpu >= 65% 2 times. - success

the above procedure creates new instance not copy software stack present on image.

how accomplish auto scaling in such way when aws auto scaling happens, tomcat server part of ami copied , started in new scaled out instance.

do have use puppet/chef or such tools achieve this? or there option in aws using command line?

please note elastic load balancer automatically adds new instance on per launch configurations shows 'out of service' since there no apache server installed on new scaled instance.

you create amis directly ec2 instances, not snapshots. snapshots ebs volumes. check created ami correctly running ec2 instance on have apache/tomcat installed , running (and configured autostart on reboot).

no, not have use puppet/chef or other cm tool. can want in couple of ways:

  1. the simplest way create ami running ec2 instance , configure auto scaling group launch new instances ami based on metric.
  2. use base ami without apache/tomcat or software , bootstrap new instances @ launch time download , configure needed.

the disadvantage of #1 amis out of date quickly. disadvantage of #2 instances taken longer come service. recommend combination of #1 , #2, capture new ami every few months , becomes base ami launching , update instance @ launch time via userdata init script.


Comments

Post a Comment

Popular posts from this blog

python - TypeError: start must be a integer -

-
i trying draw 5 turtles, getting typeerror on line 25. here code: import turtle wn = turtle.screen() redrose = turtle.turtle() color = input("what background color be?") fillcolor_f = input("what color of rose be?") redrose.hideturtle() redrose.speed(30) redrose.penup() redrose.left(180) redrose.forward(175) redrose.right(90) redrose.forward(30) redrose.right(90) redrose.pendown() def drawrose(red): redrose.color("pink") redrose.fillcolor(fillcolor_f) redrose.fill(true) in range(red): redrose.forward(i) redrose.right(49) in range(5): drawrose(redrose) redrose.penup() redrose.forward(350) redrose.right(144) redrose.pendown() redrose.fill(false) drawrose(50) wn.bgcolor(color) i trying draw 5 roses, produces errors. doing in interactivepython.org. you recursively calling drawrose wrong parameter. on line 23 ( for in range(red): ) expect red integer...
Read more

c# - DevExpress RepositoryItemComboBox BackColor property ignored -

-
i have following code almost works properly; private void cbstatus_drawitem(object sender, listboxdrawitemeventargs e) { string item = e.item string; if (item != null) { switch (item) { case "1": e.appearance.forecolor = color.green; e.appearance.backcolor = color.green; break; case "2": e.appearance.forecolor = color.orange; e.appearance.backcolor = color.orange; break; case "3": e.appearance.forecolor = color.red; e.appearance.backcolor = color.red; break; } } } when dropdown shown, items forecolor correct, backcolor remains whatever backcolor of theme is; i.e. if i've got set dark theme, backcolor dark, cells in gridview, rather being green/orange/red. i've tried setting e.appearance.options.usebackcolor trying set e....
Read more

django - Creating multiple model instances in DRF3 -

-
1) create multiple model instances 1 api call, asked here: how create multiple model instances django rest framework? tried solution named in link, no success. i trying upload multiple files in 1 api call. result: files uploaded (only once overwrote perform_create) 1 instance created (if send 2 files, latter created instance). my code: class fileuploadserializer(serializers.modelserializer): def __init__(self, *args, **kwargs): many = kwargs.pop('many', true) super(fileuploadserializer, self).__init__(many=many, *args, **kwargs) class meta: model = fileupload read_only_fields = ('created', 'datafile', 'owner') class fileuploadviewset(viewsets.modelviewset): queryset = fileupload.objects.all() serializer_class = fileuploadserializer parser_classes = (multipartparser, formparser, ) def perform_create(self, serializer): file_list = self.request.data.getlist('file') ...
Read more