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小编给大家分享一下Fabric网络环境启动过程的示例分析,希望大家阅读完这篇文章之后都有所收获,下面让我们一起去探讨吧!
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之前我们讲到 fabric网络环境的启动测试,主要是使用 ./network_setup.sh up这个命令,所以fabric网络环境启动的重点就在network_setup.sh这个文件中。接下来我们就分析一下network_setup.sh这个文件 network_setup.sh其中包括两个部分,一个是利用generateArtifacts.sh脚本文件配置组织关系和颁发证书、公/私钥、通道证书等,另一个是docker-compose-cli.yaml用于根据配置启动集群并测试chaincode的示例代码。
首先看下generateArtifacts.sh脚本文件,它包含三个函数,分别是:
1.generateCerts: 该函数使用cryptogen工具根据crypto-config.yaml来生成公私钥和证书信息等。 2.replacePrivateKey: 将docker-compose-e2e-template.yaml文档中的ca私钥替换成具体的私钥。 3.generateChannelArtifacts: 使用configtxgen工具根据configtx.yaml文件来生成创世区块和通道相关信息,更新锚节点。
接着是docker-compose-cli.yaml文件docker-compose-cli.yaml文件根据组织关系启动docker集群,并在cli容器中执行command命令运行./scripts/script.sh脚本文件。 那./scripts/script.sh脚本具体做了什么呢?
1.createChannel:创建channel。 2. joinChannel:将每个peer节点加入channel。 3. updateAnchorPeers:更新锚节点 4. installChaincode:部署chaincode。 5. instantiateChaincode:初始化chaincode。 6. chaincodeQuery:chaincode查询
另外docker-compose-cli.yaml这个文件还有一个配置项是需要注意的地方,那就是:
file: base/docker-compose-base.yaml
这里的docker-compose-base.yaml其实就是Orderer和peer的基础配置文件,包括指定端口等。
基于crypto-config.yaml(此文件在../fabric/examples/e2e_cli中)生成公、私钥和证书信息,并保存在crypto-config文件夹中。另外crypto-config.yaml还定义了组织成员以及组织下的peer节点个数。 crypto-config.yaml文件讲解:字段Name和Domain就是关于这个组织的名字和域名,这主要是用于生成证书的时候,证书内会包含该信息。而Template.Count=2是说我们要生成2套公私钥和证书,一套是peer0.org1的,还有一套是peer1.org1的(也就指定了org中存在peer0和peer1两个节点)。最后Users.Count=1是说每个Template下面会有几个普通User(注意,Admin是Admin,不包含在这个计数中),这里配置了1,也就是说我们只需要一个普通用户User1@org1.example.com 我们可以根据实际需要调整这个配置文件,增删Org Users等。文件内容如下:
# --------------------------------------------------------------------------- # Orderer # --------------------------------------------------------------------------- - Name: Orderer Domain: example.com # --------------------------------------------------------------------------- # "Specs" - See PeerOrgs below for complete description # --------------------------------------------------------------------------- Specs: - Hostname: orderer # --------------------------------------------------------------------------- # "PeerOrgs" - Definition of organizations managing peer nodes # --------------------------------------------------------------------------- PeerOrgs: # --------------------------------------------------------------------------- # Org1 # --------------------------------------------------------------------------- - Name: Org1 Domain: org1.example.com # --------------------------------------------------------------------------- # "Specs" # --------------------------------------------------------------------------- # Uncomment this section to enable the explicit definition of hosts in your # configuration. Most users will want to use Template, below # # Specs is an array of Spec entries. Each Spec entry consists of two fields: # - Hostname: (Required) The desired hostname, sans the domain. # - CommonName: (Optional) Specifies the template or explicit override for # the CN. By default, this is the template: # # "{{.Hostname}}.{{.Domain}}" # # which obtains its values from the Spec.Hostname and # Org.Domain, respectively. # --------------------------------------------------------------------------- # Specs: # - Hostname: foo # implicitly "foo.org1.example.com" # CommonName: foo27.org5.example.com # overrides Hostname-based FQDN set above # - Hostname: bar # - Hostname: baz # --------------------------------------------------------------------------- # "Template" # --------------------------------------------------------------------------- # Allows for the definition of 1 or more hosts that are created sequentially # from a template. By default, this looks like "peer%d" from 0 to Count-1. # You may override the number of nodes (Count), the starting index (Start) # or the template used to construct the name (Hostname). # # Note: Template and Specs are not mutually exclusive. You may define both # sections and the aggregate nodes will be created for you. Take care with # name collisions # --------------------------------------------------------------------------- Template: Count: 2 # Start: 5 # Hostname: {{.Prefix}}{{.Index}} # default # --------------------------------------------------------------------------- # "Users" # --------------------------------------------------------------------------- # Count: The number of user accounts _in addition_ to Admin # --------------------------------------------------------------------------- Users: Count: 1 # --------------------------------------------------------------------------- # Org2: See "Org1" for full specification # --------------------------------------------------------------------------- - Name: Org2 Domain: org2.example.com Template: Count: 2 Users: Count: 1
注:peer: Fabric 网络中的节点,表现为一个运行着的docker容器。可以与网络中的其他peer进行通信,每个peer都在本地保留一份ledger的副本。它是org下的组织成员。 org: 一个组织,它可以由一个或多个peer组成。 Orderer : 联盟成员共享的中心化节点。用来对交易进行排序,是 Fabric 共识机制的重要组成部分。
基于configtx.yaml(此文件在../fabric/examples/e2e_cli中)生成创世区块和通道相关信息,并保存在channel-artifacts文件夹。还可以指定背书策略。configtx.yaml文件讲解:1.官方提供的examples/e2e_cli/configtx.yaml这个文件里面配置了由2个Org参与的Orderer共识配置TwoOrgsOrdererGenesis,以及由2个Org参与的Channel配置:TwoOrgsChannel。 2.另外我们可以在此文件的Orderer部分设置共识的算法是Solo还是Kafka,以及共识时区块大小,超时时间等,我们使用默认值即可,不用更改。而Peer节点的配置包含了MSP的配置,锚节点的配置。如果我们有更多的Org,或者有更多的Channel,那么就可以根据模板进行对应的修改。 3.Policies配置也要特别注意,该配置项定义了不同角色的权限,Reader,Writer以及Admin分别对应读,写,以及admin权限,读权限角色只能从别的peer节点同步账本而不能发起交易,只有writer定义项下的角色才拥有发起交易的也就是调用chaincode的invoke方法的权限(不一定都是invoke方案,只要涉及到chaincode中状态修改的方法,都只有拥有writer权限或admin权限的角色才能调用)。以该配置的Organizations配置下的Org1配置为例,"OR('Org1MSP.admin', 'Org1MSP.client')",表示org1的msp服务中的admin或者client角色拥有发起交易的权限。文件内容如下:
# Copyright IBM Corp. All Rights Reserved. # # SPDX-License-Identifier: Apache-2.0 # --- ################################################################################ # # Profile # # - Different configuration profiles may be encoded here to be specified # as parameters to the configtxgen tool # ################################################################################ Profiles: TwoOrgsOrdererGenesis: Orderer: <<: *OrdererDefaults Organizations: - *OrdererOrg Consortiums: SampleConsortium: Organizations: - *Org1 - *Org2 TwoOrgsChannel: Consortium: SampleConsortium Application: <<: *ApplicationDefaults Organizations: - *Org1 - *Org2 ################################################################################ # # Section: Organizations # # - This section defines the different organizational identities which will # be referenced later in the configuration. # ################################################################################ Organizations: # SampleOrg defines an MSP using the sampleconfig. It should never be used # in production but may be used as a template for other definitions - &OrdererOrg # DefaultOrg defines the organization which is used in the sampleconfig # of the fabric.git development environment Name: OrdererOrg # ID to load the MSP definition as ID: OrdererMSP # MSPDir is the filesystem path which contains the MSP configuration MSPDir: crypto-config/ordererOrganizations/example.com/msp - &Org1 # DefaultOrg defines the organization which is used in the sampleconfig # of the fabric.git development environment Name: Org1MSP # ID to load the MSP definition as ID: Org1MSP MSPDir: crypto-config/peerOrganizations/org1.example.com/msp AnchorPeers: # AnchorPeers defines the location of peers which can be used # for cross org gossip communication. Note, this value is only # encoded in the genesis block in the Application section context - Host: peer0.org1.example.com Port: 7051 - &Org2 # DefaultOrg defines the organization which is used in the sampleconfig # of the fabric.git development environment Name: Org2MSP # ID to load the MSP definition as ID: Org2MSP MSPDir: crypto-config/peerOrganizations/org2.example.com/msp AnchorPeers: # AnchorPeers defines the location of peers which can be used # for cross org gossip communication. Note, this value is only # encoded in the genesis block in the Application section context - Host: peer0.org2.example.com Port: 7051 ################################################################################ # # SECTION: Orderer # # - This section defines the values to encode into a config transaction or # genesis block for orderer related parameters # ################################################################################ Orderer: &OrdererDefaults # Orderer Type: The orderer implementation to start # Available types are "solo" and "kafka" OrdererType: solo Addresses: - orderer.example.com:7050 # Batch Timeout: The amount of time to wait before creating a batch BatchTimeout: 2s # Batch Size: Controls the number of messages batched into a block BatchSize: # Max Message Count: The maximum number of messages to permit in a batch MaxMessageCount: 10 # Absolute Max Bytes: The absolute maximum number of bytes allowed for # the serialized messages in a batch. AbsoluteMaxBytes: 98 MB # Preferred Max Bytes: The preferred maximum number of bytes allowed for # the serialized messages in a batch. A message larger than the preferred # max bytes will result in a batch larger than preferred max bytes. PreferredMaxBytes: 512 KB Kafka: # Brokers: A list of Kafka brokers to which the orderer connects # NOTE: Use IP:port notation Brokers: - 127.0.0.1:9092 # Organizations is the list of orgs which are defined as participants on # the orderer side of the network Organizations: ################################################################################ # # SECTION: Application # # - This section defines the values to encode into a config transaction or # genesis block for application related parameters # ################################################################################ Application: &ApplicationDefaults # Organizations is the list of orgs which are defined as participants on # the application side of the network Organizations:
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