从 /usr/local/var 卸载 elasticsearch 并在 MacOSX 上安装另一个版本

Question

我试图在我的 Mac 机器上将 elasticsearch 从 6.8.4 降级到 5.6。但不知何故，我弄乱了 6.8.4 的现有安装，现在我既无法修复当前安装的版本，也无法安装 5.6

详情：

我的系统上正确安装了 6.8.4，我成功地访问了http://localhost:9200/ 端口并查看了版本信息和所有其他详细信息。但由于依赖，我不得不将版本降级到 5.6

我遵循本指南 https://gist.github.com/govindpatel/0660b33a343b807664972b53c3b12ca0 并通过删除 plist 条目和其他详细信息来搞乱 6.8.4 的安装。现在，当我尝试通过键入 $ elasticsearch 来启动弹性搜索服务时，我得到：-bash: elasticsearch: command not found 和 $ brew service restart elasticsearch 给了我 Error: Unknown command: service

但是，当我触发这个命令时，我仍然可以看到 6.8.4：

$ brew info elasticsearch
elasticsearch: stable 6.8.4, HEAD
Distributed search & analytics engine
https://www.elastic.co/products/elasticsearch
Not installed
From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/elasticsearch.rb
==> Requirements
  Required: java = 1.8 ✔
==> Options
  --HEAD
  Install HEAD version
==> Caveats
  Data:    /usr/local/var/lib/elasticsearch/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/var/elasticsearch/plugins/
  Config:  /usr/local/etc/elasticsearch/


To have launchd start elasticsearch now and restart at login:
  brew services start elasticsearch
Or, if you don't want/need a background service you can just run:
  elasticsearch
==> Analytics
  install: 8,690 (30 days), 23,748 (90 days), 122,267 (365 days)
  install_on_request: 8,233 (30 days), 22,565 (90 days), 114,157 (365 days)
  build_error: 0 (30 days)

我什至尝试安装 5.6（通过 Homebrew） - brew install elasticsearch@5.6 并将 PATH 设置在 ~/.bash_profile 的首位，但没有运气！ :(

请帮助和建议：

1. 如何修复现有的 6.8.4 版本，以及
2. 我怎样才能系统地降级（因为现有的conf，数据位于/usr/local文件夹下）

当前详细信息：查看 elasticsearch 是否正在运行：$ launchctl list | grep elasticsearch，我得到：- 1 homebrew.mxcl.elasticsearch@5.6，但我目前没有安装（附上 o/p）-$ brew uninstall elasticsearch@5.6 ~> Error: No such keg: /usr/local/Cellar/elasticsearch@5.6

[更新-1]

发完这个，我又试了运行ES安装命令：brew install elasticsearch

Updating Homebrew...
==> Auto-updated Homebrew!
  Updated 2 taps (homebrew/core and homebrew/cask).
  No changes to formulae.

==> Downloading 
  https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-oss-6.8.4.tar.gz
Already downloaded: /Library/Caches/Homebrew/downloads/elasticsearch-oss-6.8.4.tar.gz
==> Caveats
  Data:    /usr/local/var/lib/elasticsearch/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/var/elasticsearch/plugins/
  Config:  /usr/local/etc/elasticsearch/

To have launchd start elasticsearch now and restart at login:
  brew services start elasticsearch
Or, if you don't want/need a background service you can just run:
  elasticsearch
==> Summary
  ????    /usr/local/Cellar/elasticsearch/6.8.4: 133 files, 103.2MB, built in 6 seconds

然后启动服务$ brew services start elasticsearch ~> ==> Successfully startedelasticsearch(label: homebrew.mxcl.elasticsearch)。现在，当我尝试访问端口时：http://localhost:9200 - 它正在工作（从 0 安装虽然修复了这个问题！）

{
  "name" : "DwQRyf7",
  "cluster_name" : "elasticsearch_Puneet",
  "cluster_uuid" : "hLAu9onQSiuQHOpm_e9IKw",
  "version" : {
    "number" : "6.8.4",
    "build_flavor" : "oss",
    "build_type" : "tar",
    "build_hash" : "bca0c8d",
    "build_date" : "2019-10-16T06:19:49.319352Z",
    "build_snapshot" : false,
    "lucene_version" : "7.7.2",
    "minimum_wire_compatibility_version" : "5.6.0",
    "minimum_index_compatibility_version" : "5.0.0"
  },
  "tagline" : "You Know, for Search"
}

现在唯一的问题是，如何系统地降级？

[更新-2]

现在我有 6.8.4，我检查了其他版本：brew search elasticsearch 并得到了 5.6。然后我用brew install elasticsearch@5.6安装了5.6

Updating Homebrew...
==> Auto-updated Homebrew!
  Updated 1 tap (homebrew/cask).
  No changes to formulae.
==> Downloading https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.6.16.tar.gz
  Already downloaded: /Library/Caches/Homebrew/downloads/3d7cc028f605699065bd403b0a2383db8d7413c570df57e26fc87a735126c96c--elasticsearch-5.6.16.tar.gz
==> Caveats
  Data:    /usr/local/var/elasticsearch/elasticsearch_Puneet/
  Logs:    /usr/local/var/log/elasticsearch/elasticsearch_Puneet.log
  Plugins: /usr/local/opt/elasticsearch@5.6/libexec/plugins/
  Config:  /usr/local/etc/elasticsearch/
  plugin script: /usr/local/opt/elasticsearch@5.6/libexec/bin/elasticsearch-plugin

elasticsearch@5.6 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.

If you need to have elasticsearch@5.6 first in your PATH run:
  echo 'export PATH="/usr/local/opt/elasticsearch@5.6/bin:$PATH"' >> ~/.bash_profile


To have launchd start elasticsearch@5.6 now and restart at login:
  brew services start elasticsearch@5.6
Or, if you don't want/need a background service you can just run:
  /usr/local/opt/elasticsearch@5.6/bin/elasticsearch
==> Summary
  ????  /usr/local/Cellar/elasticsearch@5.6/5.6.16: 106 files, 36.0MB, built in 6 seconds

然后我将 5.6 添加到 $PATH。现在，当我尝试使用 brew switch elasticsearch 5.6 切换弹性搜索版本时，我得到：

Error: elasticsearch does not have a version "5.6" in the Cellar.
elasticsearch installed versions: 6.8.4

知道我在这里缺少什么吗？

Answer 1

经过一段时间的故障排除，我似乎找到了解决方案。

为了在您的开发机器上维护多个版本的 elasticsearch，您需要执行以下操作：

假设我安装了 6.8.4，我还想要另一个版本。为了同时维护这两者，首先检查您的系统（mac）的所有版本：brew search elasticsearch，我的系统有 3 个支持 ES 的版本：

1. elasticsearch - 最新稳定（已安装）
2. elasticsearch@2.4
3. elasticsearch@5.6

为了拥有 2.4，您必须执行以下操作：

$ brew install elasticsearch@2.4
# After installation type:
$ brew services stop elasticsearch
# above command will stop elasticsearch (lastest stable) service
# add 2.4 to $PATH
$ echo 'export PATH="/usr/local/opt/elasticsearch@2.4/bin:$PATH"' >> ~/.bash_profile
# start the service of 2.4
$ brew services start elasticsearch@2.4
# check for the service/installation
$ launchctl list | grep elasticsearch
# above command should show you a port

现在您可以在浏览器中点击http://localhost:9200，它应该会显示 2.4

切换回最新的稳定版本：

$ brew services stop elasticsearch
# remove entry from $PATH variable
$ brew services start elasticsearch

在我看来brew switch elasticsearch [VERSION] 不起作用