Chef and Docker: Where is the line?

DevOps KC meetup 2016/03/22
https://www.youtube.com/watch?v=9WPw_CqJycE

Transcript

1. Configuration Management
   and
   Docker
   

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2. Chef
   4 years
   Docker
   6 months
   Aaron Blythe
   

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4. Work from Home
   

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5. Install Package
   Trinity
   of Config Management
   Manage Service Config Files
   

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6. Trinity
   

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7. Trinity
   

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9. Install Package
   Trinity
   of Config Management
   Manage Service Config Files
   

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10. package ‘httpd' do
    action :install
    end
    Trinity
    of Config Management (Chef)
    service "httpd" do
    action :start
    end
    template 'httpd.conf' do
    action :create
    source 'httpd.conf.erb'
    owner 'root'
    group ‘root’
    mode '0644'
    notifies :reload, 'service[httpd]', :delayed
    end
    

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11. package ‘httpd' do
    action :install
    end
    template 'httpd.conf' do
    action :create
    source 'httpd.conf.erb'
    owner 'root'
    group ‘root’
    mode '0644'
    notifies :reload, 'service[httpd]', :delayed
    end
    service "httpd" do
    action :start
    end
    Chef Recipe
    

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13. Install Package
    Trinity
    of Config Management
    Manage Service Config Files
    

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14. RUN yum -y update && yum clean all
    RUN yum -y install httpd && yum clean all
    Trinity
    of Config Management (Docker)
    CMD ["/run-httpd.sh"] RUN sed -i 's@#Include conf/extra/httpd-ssl.conf@Include conf/extra/httpd-ssl.conf@' /usr/local/apac
    RUN sed -i 's@#LoadModule ssl_module modules/mod_ssl.so@LoadModule ssl_module modules/mo
    RUN sed -i 's@#LoadModule socache_shmcb_module modules/mod_socache_shmcb.so@LoadMod
    Shell out
    

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15. RUN yum -y update && yum clean all
    RUN yum -y install httpd && yum clean all
    Trinity
    of Config Management (Docker)
    CMD ["/run-httpd.sh"] COPY ./httpd.conf /etc/httpd/conf/httpd.conf
    

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16. RUN yum -y update && yum clean all
    RUN yum -y install httpd && yum clean all
    Trinity
    of Config Management (Docker)
    CMD ["/run-httpd.sh"] VOLUME [“/etc/httpd/conf/httpd.conf“]
    

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17. RUN yum -y update && yum clean all
    RUN yum -y install httpd && yum clean all
    VOLUME [“/etc/httpd/conf/httpd.conf“]
    CMD ["/run-httpd.sh"]
    Dockerfile
    

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18. What I like about Docker
    • Speed (after the initial download)
    • Sharing of resources
    • “Don’t think of Container as Mini-VM” Chase
    

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19. Concerns
    • File system size https://imagelayers.io/
    

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20. Concerns
    • Is the volume mounting to manage configs tenable?
    • Cutting myself off from Chef community cookbooks.
    • When/How should I shoot for immutable server?
    • How should I be re-writing my apps for:
    • Service discovery?
    • Hiding but still using secrets?
    

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21. Demo
    • https://hub.docker.com/
    • https://github.com/hearstat
    • https://github.com/chef-cookbooks/docker
    

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