从 /usr/local/var 卸载 elasticsearch，然后在 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：

我的系统上正确安装了6.8.4，并且我成功地点击了 http://localhost:9200/端口并查看版本信息和所有其他详细信息。但是由于依赖关系，我不得不将版本降级到5.6

我 https://gist.github.com/govindpatel/0660b33a343b807664972b53c3b12ca0 遵循本指南，并通过删除plist条目和其他详细信息来搞砸 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，当我触发此命令时，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设置为~/.bash_profile的第一名，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它(因为现有的 conf，数据位于/usr/local 文件夹下)

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

[更新-1]

发布此内容后，我尝试再次运行 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

然后启动了服务$ brew services start elasticsearch~>==> Successfully started弹性搜索(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"
}

现在剩下的唯一问题是，我怎样才能系统地降级它？

[更新-2]

现在我有了 6.8.4，我已经检查了其他版本：brew search elasticsearch并得到了 5.6。然后我安装了带有 5.6brew install elasticsearch@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

然后我在$PATH中添加了 5.6 .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

知道我在这里错过了什么吗？

Answer 1

看起来我在故障排除一段时间后找到了解决方案。

为了在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，我也想要另一个版本。为了维护两者，首先通过键入以下内容来检查您的系统(mac)的所有版本：brew search elasticsearch和我的系统支持 3 个版本 ES：

1. elasticsearch - 最新且稳定(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，它应该显示2.4

要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