我正在尝试将Elastic Search从7降级到6，因为我使用的应用程序仅适用于6。
当我安装6时，由于某种原因我升至7：
{
"name" : "activecollab-v6",
"cluster_name" : "elasticsearch",
"cluster_uuid" : "D7qs_zqTTX6Rv8AiE_ioqw",
"version" : {
"number" : "7.1.0",
"build_flavor" : "default",
"build_type" : "deb",
"build_hash" : "606a173",
"build_date" : "2019-05-16T00:43:15.323135Z",
"build_snapshot" : false,
"lucene_version" : "8.0.0",
"minimum_wire_compatibility_version" : "6.8.0",
"minimum_index_compatibility_version" : "6.0.0-beta1"
},
"tagline" : "You Know, for Search"
}
如何确保我被降级？以下是我的安装食谱，下面是食谱报告，该报告显示也安装了弹性搜索。
# Install Elastic Search
echo ">> Installing Elastic GPG Key"
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
echo ">> Install apt-transport-https"
apt install apt-transport-https
echo ">> Adding deb package"
echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
echo ">> Updating apt"
apt update
echo ">> Installing Java and Elastic Search"
apt -y install default-jre elasticsearch
echo ">> Java Installed"
echo ">> Elastic Search Installed"
echo ">> Scheduling Elasticsearch"
/bin/systemctl daemon-reload
/bin/systemctl enable elasticsearch.service
echo ">> Starting Elasticsearch"
systemctl start elasticsearch.service
echo ">> Running on port 9200. Make sure to add a firewall rule if you need external access."
echo ">> You can check the status by running 'curl 'http://localhost:9200'. Note: may take a few seconds before elasticsearch is fully started."
食谱报告
>> Installing Elastic GPG Key
Warning: apt-key output should not be parsed (stdout is not a terminal)
OK
>> Install apt-transport-https
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
Reading package lists...
Building dependency tree...
Reading state information...
apt-transport-https is already the newest version (1.6.10).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
>> Adding deb package
deb https://artifacts.elastic.co/packages/6.x/apt stable main
>> Updating apt
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
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Fetched 32.8 MB in 8s (4196 kB/s)
Reading package lists...
Building dependency tree...
Reading state information...
7 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:2
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:3
W: Target Packages (main/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Packages (main/binary-all/Packages) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target Translations (main/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-amd64) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
W: Target CNF (main/cnf/Commands-all) is configured multiple times in /etc/apt/sources.list.d/elastic-6.x.list:1 and /etc/apt/sources.list.d/elastic-6.x.list:4
>> Installing Java and Elastic Search
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
Reading package lists...
Building dependency tree...
Reading state information...
default-jre is already the newest version (2:1.11-68ubuntu1~18.04.1).
The following NEW packages will be installed:
elasticsearch
0 upgraded, 1 newly installed, 0 to remove and 7 not upgraded.
Need to get 347 MB of archives.
After this operation, 572 MB of additional disk space will be used.
Get:1 https://artifacts.elastic.co/packages/7.x/apt stable/main amd64 elasticsearch amd64 7.1.0 [347 MB]
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
debconf: unable to initialize frontend: Readline
debconf: (This frontend requires a controlling tty.)
debconf: falling back to frontend: Teletype
dpkg-preconfigure: unable to re-open stdin:
Fetched 347 MB in 6s (57.1 MB/s)
Selecting previously unselected package elasticsearch.
(Reading database ...
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
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(Reading database ... 25%
(Reading database ... 30%
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(Reading database ... 45%
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(Reading database ... 100%
(Reading database ... 91269 files and directories currently installed.)
Preparing to unpack .../elasticsearch_7.1.0_amd64.deb ...
Creating elasticsearch group... OK
Creating elasticsearch user... OK
Unpacking elasticsearch (7.1.0) ...
Processing triggers for ureadahead (0.100.0-21) ...
Setting up elasticsearch (7.1.0) ...
Created elasticsearch keystore in /etc/elasticsearch
Processing triggers for systemd (237-3ubuntu10.21) ...
Processing triggers for ureadahead (0.100.0-21) ...
>> Java Installed
>> Elastic Search Installed
>> Scheduling Elasticsearch
Synchronizing state of elasticsearch.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable elasticsearch
Created symlink /etc/systemd/system/multi-user.target.wants/elasticsearch.service → /usr/lib/systemd/system/elasticsearch.service.
>> Starting Elasticsearch
>> Running on port 9200. Make sure to add a firewall rule if you need external access.
>> You can check the status by running 'curl 'http://localhost:9200'. Note: may take a few seconds before elasticsearch is fully started.
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
答案 0 :(得分：1)
更新：
我可以在输出中看到/etc/apt/sources.list.d/elastic-6.x.list行，因此您已经添加了6.x和7.x存储库。删除7.x存储库（sudo apt-get install elasticsearch=6.8.0），清除并重新安装。
或者，您可以清除elasticsearch并指定要安装的版本：apt-cache policy elasticsearch。我认为这是您可以选择的版本号，但是您可以验证course可用的版本号。
答案 1 :(得分：0)
我在同一位置将弹性搜索从7降级到6，而又不会丢失数据。我做的简单技巧是，删除现有的elasticsearch，然后安装一个新的。它为我工作。我想给你降级的步骤。我正在使用ubuntu服务器。因此，
sudo service elasticsearch stop sudo apt-get remove elasticsearch 安装参考链接：Install elasticsearch in ubuntu
wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch | sudo apt-key add -
sudo apt-get install apt-transport-https
echo "deb https://artifacts.elastic.co/packages/6.x/apt stable main" | sudo tee -a /etc/apt/sources.list.d/elastic-6.x.list
sudo apt-get update && sudo apt-get install elasticsearch
Elasticsearch可能会自动启动。您可以检查状态：sudo service elasticsearch status。如果显示失败，则可以使用sudo service elasticsearch restart或sudo systemctl restart elasticsearch重新启动它。它应该重新启动elasticsearch服务器。
完成。
警告！
我不能保证数据会在那里。因此，在执行此步骤之前，请确保备份数据。是的，我确实没有丢失数据。