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張 旭

Flynn: first preview release | Hacker News - 0 views

news.ycombinator.com/item

docker consul system service discovery dns

shared by 張 旭 on 25 Nov 15 - No Cached
  • Etcd and Zookeeper provide essentially the same functionality. They are both a strongly consistent key/value stores that support notifications to clients of changes. These two projects are limited to service discovery
  • So lets say you had a client application that would talk to a node application that could be on any number of servers. What you could do is hard code that list into your application and randomly select one, in order to "fake" load balancing. However every time a machine went up or down you would have to update that list.
  • What Consul provides is you just tell your app to connect to "mynodeapp.consul" and then consul will give you the proper address of one of your node apps.
  • ...9 more annotations...
  • Consul and Skydock are both applications that build on top of a tool like Zookeeper and Etcd.
  • What a developer ideally wants to do is just push code and not have to worry about what servers are running what, and worry about failover and the like
  • What Flynn provides (if I get it), is a diy Heroku like platform
  • Another project that I believe may be similar to Flynn is Apache Mesos.
  • a self hosted Heroku
  • Google Omega is Google's answer to Apache Mesos
  • Omega would need a service like Raft to understand what services are currently available
  • Raft is a consensus algorithm for keeping a set of distributed state machines in a consistent state.
  • I want to use Docker, but it has no easy way to say "take this file that contains instructions and make everything". You can write Dockerfiles, but you can only use one part of the stack in them, otherwise you run into trouble.
  • 張 旭 on 25 Nov 15
     
    " So lets say you had a client application that would talk to a node application that could be on any number of servers. What you could do is hard code that list into your application and randomly select one, in order to "fake" load balancing. However every time a machine went up or down you would have to update that list. What Consul provides is you just tell your app to connect to "mynodeapp.consul" and then consul will give you the proper address of one of your node apps."
crazylion lee

GitHub - fabiolb/fabio: Consul Load-Balancing made simple - 0 views

github.com/fabio

loadbalancing consul

shared by crazylion lee on 26 Jan 18 - No Cached
  • crazylion lee on 26 Jan 18
     
    "consul Load-Balancing made simple https://fabiolb.net"
張 旭

Secrets Management with Terraform - 0 views

www.linode.com/...rets-management-with-terraform

terraform config devops security

shared by 張 旭 on 12 Apr 19 - No Cached
  • Terraform is an Infrastructure as Code (IaC) tool that allows you to write declarative code to manage your infrastructure.
  • Keeping Secrets Out of .tf Files
  • .tf files contain the declarative code used to create, manage, and destroy infrastructure.
  • ...17 more annotations...
  • .tf files can accept values from input variables.
  • variable definitions can have default values assigned to them.
  • values are stored in separate files with the .tfvars extension.
  • looks through the working directory for a file named terraform.tfvars, or for files with the .auto.tfvars extension.
  • add the terraform.tfvars file to your .gitignore file and keep it out of version control.
  • include an example terraform.tfvars.example in your Git repository with all of the variable names recorded (but none of the values entered).
  • terraform apply -var-file=myvars.tfvars
  • Terraform allows you to keep input variable values in environment variables.
  • the prefix TF_VAR_
  • If Terraform does not find a default value for a defined variable; or a value from a .tfvars file, environment variable, or CLI flag; it will prompt you for a value before running an action
  • state file contains a JSON object that holds your managed infrastructure’s current state
  • state is a snapshot of the various attributes of your infrastructure at the time it was last modified
  • sensitive information used to generate your Terraform state can be stored as plain text in the terraform.tfstate file.
  • Avoid checking your terraform.tfstate file into your version control repository.
  • Some backends, like Consul, also allow for state locking. If one user is applying a state, another user will be unable to make any changes.
  • Terraform backends allow the user to securely store their state in a remote location, such as a key/value store like Consul, or an S3 compatible bucket storage like Minio.
  • at minimum the repository should be private.
張 旭

Backends: State Storage and Locking - Terraform by HashiCorp - 0 views

www.terraform.io/...state.html

terraform devops system storage status

shared by 張 旭 on 07 Apr 19 - No Cached
  • Backends determine where state is stored.
  • backends happen to provide locking: local via system APIs and Consul via locking APIs.
  • manually retrieve the state from the remote state using the terraform state pull command
  • ...3 more annotations...
  • manually write state with terraform state push. This is extremely dangerous and should be avoided if possible. This will overwrite the remote state.
  • The "lineage" is a unique ID assigned to a state when it is created.
  • Every state has a monotonically increasing "serial" number.
  • 張 旭 on 07 Apr 19
     
    "Backends determine where state is stored."
張 旭

MySQL 到底能不能放到 Docker 里跑？ - 0 views

mp.weixin.qq.com/s

mysql server docker

shared by 張 旭 on 07 Aug 17 - No Cached
  • 忙碌又容易出错的工作其实是无意义的
  • 单机多实例运行 MySQL
  • MySQL 运行的就是个进程而且对 IO 要求比较高
  • ...12 more annotations...
  • Docker 的资源限制用的就是 cgroups
  • Percona：我们的备份、慢日志分析、过载保护等功能都是基于 pt-tools 工具包来实现的。
  • Consul：分布式的服务发现和配置共享软件
  • 容器调度的开源产品主要有 Kubernetes 和 mesos
  • 适合自己现状的需求才是最好的
  • 有机会做到计算调度和存储调度分离的情况下我们可能会转向 Kubernetes 的方案
  • 根据这个需求按照我们的资源筛选规则 (比如主从不能在同一台机器、内存配置不允许超卖等等)，从现有的资源池中匹配出可用资源，然后依次创建主从关系、创建高可用管理、检查集群复制状态、推送集群信息到中间件 (选用了中间件的情况下) 控制中心、最后将以上相关信息都同步到 CMDB。
    • 張 旭
      張 旭 on 07 Aug 17
       
      感覺用 K8S 就不用那麼麻煩了。
  • 每一个工作都是通过服务端发送消息到 agent，然后由 agent 执行对应的脚本，脚本会返回指定格式的执行结果
  • 备份工具我们是用 percona-xtrabackup
  • zabbix 来实现监控告警
  • grafana 是监控画图界的扛把子，功能齐全的度量仪表盘和图形编辑器，经过简单配置就能完成各种监控图形的展示。
  • (MariaDB 不支持写 table，只能写 file)，极大减少了从库复制带来的 IOPS。
張 旭

Guide to Service Discovery with Docker - 0 views

docs.datadoghq.com/...servicediscovery

docker service system server dns

shared by 張 旭 on 23 Apr 17 - No Cached
  • The Service Discovery feature watches for Docker events like when a container is created, destroyed, started or stopped. When one of these happens, the Agent identifies which service is impacted, loads the configuration template for this image, and automatically sets up its checks.
  • Configuration templates can be defined by simple template files or as single key-value stores using etcd or Consul.
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