Deployment with Docker: Apply continuous integration models, deploy applications quicker, and scale at large by putting Docker to work

Cover......Page 1
Copyright......Page 3
Credits......Page 5
About the Author......Page 6
Acknowledgments......Page 7
About the Reviewer......Page 8
www.PacktPub.com......Page 9
Customer Feedback......Page 10
Dedications......Page 11
Table of Contents......Page 12
Preface......Page 17
 The what and why of containers......Page 22
  Introduction to Docker containers......Page 25
  rkt......Page 26
  Desktop application-level virtualizations......Page 27
 When should containerization be considered?......Page 28
 The ideal Docker deployment......Page 30
  The developer workflow......Page 31
 Summary......Page 33
 Installing Docker......Page 34
 Debugging containers......Page 43
  Seeing what the container sees......Page 44
 Our first Dockerfile......Page 46
  Breaking the cache......Page 49
 A container more practical......Page 50
  Ensuring the latest patches are included......Page 52
  Applying our custom NGINX configuration......Page 53
  Building and running......Page 54
 Service from scratch......Page 57
  Setting environment variables with ENV......Page 59
  Container security layering with limited users......Page 60
  VOLUMEs and data that lives outside of the container......Page 61
  Changing the current user......Page 62
  Putting it all together......Page 63
 Summary......Page 67
 A quick review......Page 68
  Docker commands......Page 69
  Dockerfile commands......Page 70
  An overview......Page 71
  What we are going to build......Page 73
   Web server......Page 74
    Authentication......Page 76
   The database......Page 77
   The application server......Page 78
    The main application logic......Page 80
  Running it all together......Page 85
   Launching......Page 87
   Testing......Page 88
  Limitations and issues with our implementation......Page 90
    Using a local volume......Page 91
    Generating the credentials at runtime......Page 93
 Introducing Docker networking......Page 94
 Summary......Page 96
 Service discovery......Page 97
  Service Discovery in depth......Page 98
   Client-side discovery pattern......Page 100
   Hybrid systems......Page 101
   Picking the (un)available options......Page 102
 Container orchestration......Page 103
  State reconciliation......Page 104
  Docker Swarm......Page 105
  Kubernetes......Page 106
  Apache Mesos/Marathon......Page 107
  Cloud-based offerings......Page 108
  Setting up a Docker Swarm cluster......Page 109
   Initializing a Docker Swarm cluster......Page 110
   Deploying services......Page 111
  Using Swarm to orchestrate our words service......Page 115
    index.js......Page 116
   The web server......Page 118
   Database......Page 120
   Deploying it all......Page 121
   The Docker stack......Page 124
   Clean up......Page 126
 Summary......Page 127
 Docker image internals......Page 128
  How images are layered......Page 129
   Persisting the writable CoW layer(s)......Page 130
  Running your own image registry......Page 132
  Underlying storage driver......Page 136
   btrfs / zfs......Page 138
   overlay and overlay2......Page 139
   Manual cleanup......Page 140
   Automatic cleanup......Page 141
 Persistent storage......Page 143
   Bind mounts......Page 144
   Named volumes......Page 145
   Relocatable volumes......Page 148
    Relocatable volume sync loss......Page 154
 UID/GID and security considerations with volumes......Page 155
 Summary......Page 160
 Advanced debugging......Page 161
  Attaching to a container\'s process space......Page 162
   Debugging the Docker daemon......Page 164
  Static host configuration......Page 165
  DNS configuration......Page 167
  Docker built-in network mappings......Page 169
 High availability pipelines......Page 170
  Container messaging......Page 171
    index.js......Page 175
    Dockerfile......Page 177
  Mounting the Docker socket into the container......Page 180
  Host security scans......Page 182
  Read-only containers......Page 184
  Base system (package) updates......Page 186
  Privileged mode versus --cap-add and --cap-drop......Page 187
 Summary......Page 190
 Limiting service resources......Page 191
  RAM limits......Page 192
  CPU limits......Page 200
  ulimits......Page 204
  Max file descriptors......Page 207
  Socket buffers......Page 208
  Ephemeral ports......Page 209
  Netfilter tweaks......Page 211
  Multi-service containers......Page 212
 Zero-downtime deployments......Page 214
  Rolling service restarts......Page 215
  Blue-green deployments......Page 217
  Blue-turquoise-green deployments......Page 219
 Summary......Page 220
Chapter 8: Building Our Own Platform......Page 221
 Configuration management......Page 222
  Ansible......Page 223
   Installation......Page 224
   Basics......Page 225
   Usage......Page 226
  Amazon Web Services setup......Page 232
   Creating an account......Page 233
   Getting API keys......Page 234
    Using the API keys......Page 237
   Installation......Page 238
   Usage......Page 239
    Choosing the right AMI base image......Page 241
   Building the AMI......Page 243
  The road to automated infrastructure deployment......Page 245
   Running the deployment and tear-down playbooks......Page 251
 Continuous integration/Continuous delivery......Page 254
  First-deploy circular dependency......Page 262
  Further generic CI/CD uses......Page 264
 Summary......Page 265
Chapter 9: Exploring the Largest-Scale Deployments......Page 266
 Maintaining quorums......Page 267
 Node automation......Page 270
  Predictive auto-scaling......Page 272
 Monitoring......Page 273
 Evaluating next-gen technologies......Page 275
  Technological needs......Page 276
  Popularity......Page 277
  A team\'s technical competency......Page 281
 Summary......Page 282
Index......Page 283
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