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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！
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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