entityMap|blocks|key|4427806|text|对于私有注册表，docker+info中不显示任何内容。但是，注销命令将告诉您是否已登录：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4427807|+$+docker+logout+private.example.com
+Not+logged+in+to+private.example.com|code-block|syntax|javascript|4427808|(尽管这会强制您重新登录。)|4427809^0|8|B|0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|O|9|@$A|P|B|Q|C|D]]|E|@]|F|$]]|$2|G|4|H|6|I|8|R|9|@]|E|@]|F|$J|K]]|$2|L|4|M|6|7|8|S|9|@]|E|@]|F|$]]|$2|N|4|-4|6|7|8|T|9|@]|E|@]|F|$]]]]

For private registries, nothing is shown in <code>docker info</code>. However, the logout command will tell you if you were logged in:

<pre><code> $ docker logout private.example.com
 Not logged in to private.example.com
</code></pre>

(Though this will force you to log in again.)

entityMap|0|type|IMAGE|mutability|IMMUTABLE|data|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/094661764236da935947c615d9fb085a.png|imageAlt|blocks|key|4427779|text|至少在"Docker+for+Windows“中，你可以看到你是否通过UI登录到docker+hub。只需右键单击窗口通知区域中的docker图标：|unstyled|depth|inlineStyleRanges|entityRanges|4427780|📷|atomic|offset|length|4427781|​|4427782^0|0|0|1|0|0|0^^$0|$1|$2|3|4|5|6|$7|8|9|-4]]]|A|@$B|C|D|E|2|F|G|R|H|@]|I|@]|6|$]]|$B|J|D|K|2|L|G|S|H|@]|I|@$M|T|N|U|B|V]]|6|$]]|$B|O|D|P|2|F|G|W|H|@]|I|@]|6|$]]|$B|Q|D|-4|2|F|G|X|H|@]|I|@]|6|$]]]]

At least in "Docker for Windows" you can see if you are logged in to docker hub over the UI. Just right click the docker icon in the windows notification area:
<a href="https://i.stack.imgur.com/nlt5I.png" rel="noreferrer"><img src="https://i.stack.imgur.com/nlt5I.png" alt="Docker Logged in"></a>

entityMap|blocks|key|4427806|text|我使用以下两种方法之一进行此检查：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4427807|1:查看config.json文件：|4427808|如果您登录到"private.registry.com“，您将在~/.docker/config.json中看到与以下内容相同的条目|offset|length|style|CODE|4427809|"auths":+{
++++"private.registry.com":+{
++++++++"auth":+"gibberishgibberishgibberishgibberishgibberishgibberish"
++++}
+}|code-block|syntax|javascript|4427810|2:再次尝试docker登录：|4427811|如果您正在尝试查看是否已有与private.registry.com的活动会话，请尝试重新登录：|4427812|bash$+docker+login+private.registry.com
Username+(logged-in-user):|4427813|如果您得到类似于上面的输出，则意味着logged-in-user已经与private.registry.com进行了活动会话。如果只是提示您输入用户名，这将表明没有活动会话。|4427814^0|0|0|W|L|0|0|0|0|0|I|E|Z|K|0^^$0|$]|1|@$2|3|4|5|6|7|8|Y|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|Z|9|@]|A|@]|B|$]]|$2|E|4|F|6|7|8|10|9|@$G|11|H|12|I|J]]|A|@]|B|$]]|$2|K|4|L|6|M|8|13|9|@]|A|@]|B|$N|O]]|$2|P|4|Q|6|7|8|14|9|@]|A|@]|B|$]]|$2|R|4|S|6|7|8|15|9|@]|A|@]|B|$]]|$2|T|4|U|6|M|8|16|9|@]|A|@]|B|$N|O]]|$2|V|4|W|6|7|8|17|9|@$G|18|H|19|I|J]|$G|1A|H|1B|I|J]]|A|@]|B|$]]|$2|X|4|-4|6|7|8|1C|9|@]|A|@]|B|$]]]]

I use one of the following two ways for this check:

<h3>1: View config.json file:</h3>

In case you are logged in to "private.registry.com" you will see an entry for the same as following in <code>~/.docker/config.json</code>:

<pre><code>"auths": {
 "private.registry.com": {
 "auth": "gibberishgibberishgibberishgibberishgibberishgibberish"
 }
 }
</code></pre>

<h3>2: Try docker login once again:</h3>

If you are trying to see if you already have an active session with private.registry.com, try to login again:

<pre><code>bash$ docker login private.registry.com
Username (logged-in-user):
</code></pre>

If you get an output like the above, it means <code>logged-in-user</code> already had an active session with <code>private.registry.com</code>. If you are just prompted for username instead, that would indicate that there's no active session.

entityMap|blocks|key|4427867|text|使用如下命令：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4427868|docker+info+%7C+grep+'name'

WARNING:+No+swap+limit+support
Username:+jonasm2009|code-block|syntax|javascript|4427869^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

Use command like below:

<pre><code>docker info | grep 'name'

WARNING: No swap limit support
Username: &lt;strong&gt;jonasm2009&lt;/strong&gt;
</code></pre>

entityMap|blocks|key|4427904|text|正如@Christian所指出的，最好先尝试操作，然后再登录。问题是，“如果有必要”并不是那么明显，做得很健壮。一种方法是将docker操作的stderr与一些已知的字符串进行比较(通过反复试验)。例如,|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4427905|try+"docker+OPERATION"
if+it+failed:+
++++capture+the+stderr+of+"docker+OPERATION"
++++if+it+ends+with+"no+basic+auth+credentials":+
++++++++try+docker+login
++++else+if+it+ends+with+"not+found":
++++++++fatal+error:+image+name/tag+probably+incorrect
++++else+if+it+ends+with+<other+stuff+you+care+to+trap>:
++++++++...
++++else:
++++++++fatal+error:+unknown+cause

try+docker+OPERATION+again
if+this+fails:+you're+SOL!|code-block|syntax|javascript|4427906^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

As pointed out by @Christian, best to try operation first then login only if necessary. Problem is that "if necessary" is not that obvious to do robustly. One approach is to compare the stderr of the docker operation with some strings that are known (by trial and error). For example, 

<pre><code>try "docker OPERATION"
if it failed: 
 capture the stderr of "docker OPERATION"
 if it ends with "no basic auth credentials": 
 try docker login
 else if it ends with "not found":
 fatal error: image name/tag probably incorrect
 else if it ends with &lt;other stuff you care to trap&gt;:
 ...
 else:
 fatal error: unknown cause

try docker OPERATION again
if this fails: you're SOL!
</code></pre>

entityMap|blocks|key|4427948|text|docker+cli凭据方案并不令人意外地复杂，只需看一下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4427949|cat+~/.docker/config.json|offset|length|style|CODE|4427950|{
++"auths":+{
++++"dockerregistry.myregistry.com":+{},
++++"https://index.docker.io/v1/":+{}|code-block|syntax|javascript|4427951|这存在于Windows上(使用Get-Content+~\.docker\config.json)，你也可以查看凭证工具，它也列出了用户名...我想你甚至可以找回密码|4427952|.+"C:\Program+Files\Docker\Docker\resources\bin\docker-credential-wincred.exe"+list|4427953|{"https://index.docker.io/v1/":"kcd"}|4427954^0|0|0|P|0|0|F|X|0|0|2B|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|U|9|@]|A|@]|B|$]]|$2|C|4|D|6|7|8|V|9|@$E|W|F|X|G|H]]|A|@]|B|$]]|$2|I|4|J|6|K|8|Y|9|@]|A|@]|B|$L|M]]|$2|N|4|O|6|7|8|Z|9|@$E|10|F|11|G|H]]|A|@]|B|$]]|$2|P|4|Q|6|7|8|12|9|@$E|13|F|14|G|H]]|A|@]|B|$]]|$2|R|4|S|6|K|8|15|9|@]|A|@]|B|$L|M]]|$2|T|4|-4|6|7|8|16|9|@]|A|@]|B|$]]]]

The docker cli credential scheme is unsurprisingly uncomplicated, just take a look:
<code>cat ~/.docker/config.json</code>
<pre><code>{
 &quot;auths&quot;: {
 &quot;dockerregistry.myregistry.com&quot;: {},
 &quot;https://index.docker.io/v1/&quot;: {}
</code></pre>
This exists on Windows (use <code>Get-Content ~\.docker\config.json</code>) and you can also poke around the credential tool which also lists the username ... and I think you can even retrieve the password
<code>. &quot;C:\Program Files\Docker\Docker\resources\bin\docker-credential-wincred.exe&quot; list</code>
<pre><code>{&quot;https://index.docker.io/v1/&quot;:&quot;kcd&quot;}
</code></pre>

entityMap|blocks|key|4427914|text|如果您想要一个简单的true/false值，您可以通过管道将docker.json传递给jq。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4427915|is_logged_in()+{
++cat+~/.docker/config.json+%7C+jq+-r+--arg+url+"${REPOSITORY_URL}"+'.auths+%7C+has($url)'
}

if+[[+"$(is_logged_in)"+==+"false"+]];+then
++#+do+stuff,+log+in
fi|code-block|syntax|javascript|4427916^0|A|A|U|B|18|2|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|M|9|@$A|N|B|O|C|D]|$A|P|B|Q|C|D]|$A|R|B|S|C|D]]|E|@]|F|$]]|$2|G|4|H|6|I|8|T|9|@]|E|@]|F|$J|K]]|$2|L|4|-4|6|7|8|U|9|@]|E|@]|F|$]]]]

If you want a simple <code>true/false</code> value, you can pipe your <code>docker.json</code> to <code>jq</code>.

<pre><code>is_logged_in() {
 cat ~/.docker/config.json | jq -r --arg url "${REPOSITORY_URL}" '.auths | has($url)'
}

if [[ "$(is_logged_in)" == "false" ]]; then
 # do stuff, log in
fi
</code></pre>

entityMap|blocks|key|4428058|text|您可以执行以下命令来查看您登录时使用的用户名和使用的注册表：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4428059|docker+system+info+%7C+grep+-E+'Username%7CRegistry'|code-block|syntax|javascript|4428060^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|J|9|@]|A|@]|B|$F|G]]|$2|H|4|-4|6|7|8|K|9|@]|A|@]|B|$]]]]

You can do the following command to see the username you are logged in with and the registry used: 

<pre><code>docker system info | grep -E 'Username|Registry'
</code></pre>

entityMap|blocks|key|4428017|text|我的AWS+ECR构建脚本具有：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4428018|ECR_HOSTNAME="${ACCOUNT_ID}.dkr.ecr.${REGION}.amazonaws.com"
TOKEN=$(jq+-r+'.auths["'$ECR_HOSTNAME'"]["auth"]'+~/.docker/config.json)
curl+--fail+--header+"Authorization:+Basic+$TOKEN"+https://$ECR_HOSTNAME/v2/|code-block|syntax|javascript|4428019|如果访问ECR失败，则完成登录：|4428020|aws+ecr+get-login-password+--region+${REGION}+%7C+docker+login+--username+AWS+--password-stdin+https://$ECR_HOSTNAME|4428021|为此，不能使用合适的Docker凭据存储。假定~/.docker/config.json的默认凭据存储。|offset|length|style|CODE|4428022^0|0|0|0|0|N|L|0^^$0|$]|1|@$2|3|4|5|6|7|8|S|9|@]|A|@]|B|$]]|$2|C|4|D|6|E|8|T|9|@]|A|@]|B|$F|G]]|$2|H|4|I|6|7|8|U|9|@]|A|@]|B|$]]|$2|J|4|K|6|E|8|V|9|@]|A|@]|B|$F|G]]|$2|L|4|M|6|7|8|W|9|@$N|X|O|Y|P|Q]]|A|@]|B|$]]|$2|R|4|-4|6|7|8|Z|9|@]|A|@]|B|$]]]]

My AWS ECR build-script has:
<pre><code>ECR_HOSTNAME=&quot;${ACCOUNT_ID}.dkr.ecr.${REGION}.amazonaws.com&quot;
TOKEN=$(jq -r '.auths[&quot;'$ECR_HOSTNAME'&quot;][&quot;auth&quot;]' ~/.docker/config.json)
curl --fail --header &quot;Authorization: Basic $TOKEN&quot; https://$ECR_HOSTNAME/v2/
</code></pre>
If accessing ECR fails, a login is done:
<pre><code>aws ecr get-login-password --region ${REGION} | docker login --username AWS --password-stdin https://$ECR_HOSTNAME
</code></pre>
For this to work, a proper Docker credential store cannot be used. Default credentials store of <code>~/.docker/config.json</code> is assumed.

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://stackoverflow.com/questions/36022892/how-to-know-if-docker-is-already-logged-in-to-a-docker-registry-server|blocks|key|4428051|text|在Linux上，如果您通过~/.docker/config.json中的credsStore选项启用了secretservice，如下所示：|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|4428052|"credsStore":+"secretservice",|code-block|syntax|javascript|4428053|则您将不会在config.json中看到凭据。相反，您需要使用docker-credential-desktop查询凭据，有关更多详细信息，请参阅以下答案：|4428054|How+to+know+if+docker+is+already+logged+in+to+a+docker+registry+server|4428055^0|D|L|10|A|1F|D|0|0|6|B|V|P|0|0|1Y|0|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|W|G|@$H|X|I|Y|J|K]|$H|Z|I|10|J|K]|$H|11|I|12|J|K]]|L|@]|6|$]]|$A|M|C|N|2|O|F|13|G|@]|L|@]|6|$P|Q]]|$A|R|C|S|2|E|F|14|G|@$H|15|I|16|J|K]|$H|17|I|18|J|K]]|L|@]|6|$]]|$A|T|C|U|2|E|F|19|G|@]|L|@$H|1A|I|1B|A|1C]]|6|$]]|$A|V|C|-4|2|E|F|1D|G|@]|L|@]|6|$]]]]

On Linux if you have the <code>secretservice</code> enabled via the <code>credsStore</code> option in your <code>~/.docker/config.json</code> like below:
<pre><code>&quot;credsStore&quot;: &quot;secretservice&quot;,
</code></pre>
then you will not see the credentials in the <code>config.json</code>. Instead you need to query the credentials using the <code>docker-credential-desktop</code>, see the below answer for more details:
<a href="https://stackoverflow.com/questions/36022892/how-to-know-if-docker-is-already-logged-in-to-a-docker-registry-server">How to know if docker is already logged in to a docker registry server</a>

entityMap|blocks|key|4428072|text|docker+info+%7C+grep+Username|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|4428073|这应该会打印登录用户。|unstyled|4428074^0|0|0^^$0|$]|1|@$2|3|4|5|6|7|8|I|9|@]|A|@]|B|$C|D]]|$2|E|4|F|6|G|8|J|9|@]|A|@]|B|$]]|$2|H|4|-4|6|G|8|K|9|@]|A|@]|B|$]]]]

<pre><code>docker info | grep Username
</code></pre>
This should print the login user.

entityMap|blocks|key|4428105|text|下面是一个powershell+powershell命令，用于检查您以前是否使用其他人提到的文件$HOME/.docker/config.json登录过注册表：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4428106|(Get-Content+$HOME/.docker/config.json+%7C+ConvertFrom-Json).auths.PSobject.Properties.name+-Contains+"<registry_url>"|code-block|syntax|javascript|4428107|这将返回一个True+/+False布尔值，因此可以按如下方式使用：|4428108|if+((Get-Content+$HOME/.docker/config.json+%7C+ConvertFrom-Json).auths.PSobject.Properties.name+-Contains+"<registry_url>"+)+{
++++Write-Host+Already+logged+into+docker+registry
}+else+{
++++Write-Host+Logging+into+docker+registry
++++docker+login
}|4428109|如果你不想在文件不存在的情况下失败，你需要额外的检查：|4428110|if+(+(-Not+(Test-Path+$HOME/.docker/config.json))+-Or+(-Not+(Get-Content+$HOME/.docker/config.json+%7C+ConvertFrom-Json).auths.PSobject.Properties.name+-Contains+"<registry_url>")+)
{
++++Write-Host+Already+logged+into+docker+registry
}+else+{
++++Write-Host+Logging+into+docker+registry
++++docker+login
}|4428111|我之所以选择使用-Not语句，是因为出于某种原因，当您使用-And而不是-Or来链接失败条件后的命令时，命令会出错。|4428112^0|1C|P|0|0|0|0|0|0|T|4|10|3|0^^$0|$]|1|@$2|3|4|5|6|7|8|W|9|@$A|X|B|Y|C|D]]|E|@]|F|$]]|$2|G|4|H|6|I|8|Z|9|@]|E|@]|F|$J|K]]|$2|L|4|M|6|7|8|10|9|@]|E|@]|F|$]]|$2|N|4|O|6|I|8|11|9|@]|E|@]|F|$J|K]]|$2|P|4|Q|6|7|8|12|9|@]|E|@]|F|$]]|$2|R|4|S|6|I|8|13|9|@]|E|@]|F|$J|K]]|$2|T|4|U|6|7|8|14|9|@$A|15|B|16|C|D]|$A|17|B|18|C|D]]|E|@]|F|$]]|$2|V|4|-4|6|7|8|19|9|@]|E|@]|F|$]]]]

Here's a powershell powershell command to check if you have previously logged into the registry, making use of the file <code>$HOME/.docker/config.json</code> that others have mentioned:
<pre><code>(Get-Content $HOME/.docker/config.json | ConvertFrom-Json).auths.PSobject.Properties.name -Contains &quot;&lt;registry_url&gt;&quot;
</code></pre>
This returns a True / False boolean, so can use as follows:
<pre><code>if ((Get-Content $HOME/.docker/config.json | ConvertFrom-Json).auths.PSobject.Properties.name -Contains &quot;&lt;registry_url&gt;&quot; ) {
 Write-Host Already logged into docker registry
} else {
 Write-Host Logging into docker registry
 docker login
}
</code></pre>
If you want it to not fail if the file doesn't exist you need an extra check:
<pre><code>if ( (-Not (Test-Path $HOME/.docker/config.json)) -Or (-Not (Get-Content $HOME/.docker/config.json | ConvertFrom-Json).auths.PSobject.Properties.name -Contains &quot;&lt;registry_url&gt;&quot;) )
{
 Write-Host Already logged into docker registry
} else {
 Write-Host Logging into docker registry
 docker login
}
</code></pre>
I chose to use the -Not Statements because for some reason when you chain a command after a failed condition with <code>-And</code> instead of <code>-Or</code> the command errors out.

entityMap|0|type|LINK|mutability|MUTABLE|data|url|https://github.com/Azure/acr/blob/main/docs/AAD-OAuth.md#calling-post-oauth2token-to-get-an-acr-access-token|blocks|key|4428147|text|在Azure+Container+Registry+(ACR)中，以下作为登录检查：|unstyled|depth|inlineStyleRanges|entityRanges|4428148|registry="contosoregistry.azurecr.io"
curl+-v+--header+"Authorization:+Bearer+$access_token"+https://$registry/v2/_catalog|code-block|syntax|javascript|4428149|如果访问令牌已过期，将返回+HTTP/401。|akh1l|获取访问令牌的选项来自~/.docker/config.json或使用存储在+Docker+credStore+中的刷新令牌从+https://$registry/oauth2/token请求一个：echo+$registry+%7C+docker-credential-desktop+get.|offset|length|style|CODE|6hl0i|有关刷新令牌和访问令牌的更多信息，请参阅+ACR+集成docs.。^0|0|0|0|B|L|1S|U|2R|1A|0|R|4|0^^$0|$1|$2|3|4|5|6|$7|8]]]|9|@$A|B|C|D|2|E|F|X|G|@]|H|@]|6|$]]|$A|I|C|J|2|K|F|Y|G|@]|H|@]|6|$L|M]]|$A|N|C|O|2|E|F|Z|G|@]|H|@]|6|$]]|$A|P|C|Q|2|E|F|10|G|@$R|11|S|12|T|U]|$R|13|S|14|T|U]|$R|15|S|16|T|U]]|H|@]|6|$]]|$A|V|C|W|2|E|F|17|G|@]|H|@$R|18|S|19|A|1A]]|6|$]]]]

In Azure Container Registry (ACR) following works as a login-check:
<pre class="lang-sh prettyprint-override"><code>registry=&quot;contosoregistry.azurecr.io&quot;
curl -v --header &quot;Authorization: Bearer $access_token&quot; https://$registry/v2/_catalog
</code></pre>
If access token has expired, a HTTP/401 will be returned.
Options for getting an access token are from <code>~/.docker/config.json</code> or requesting one from <code>https://$registry/oauth2/token</code> using a refresh token stored into Docker credStore: <code>echo $registry | docker-credential-desktop get</code>.
More information about refresh tokens and access tokens are at ACR integration <a href="https://github.com/Azure/acr/blob/main/docs/AAD-OAuth.md#calling-post-oauth2token-to-get-an-acr-access-token" rel="nofollow noreferrer">docs</a>.

I'm not sure if I have already logged in to a docker registry in cmd line by using cmd: docker login. How can you test or see whether you are logged in or not, without trying to push?

How to know if docker is already logged in to a docker registry server

Windows

Docker

Linux

我不确定我是否已经使用cmd: docker login登录到cmd行中的docker注册表。如何在不尝试推送的情况下测试或查看您是否已登录？

问如何知道docker是否已经登录到docker注册中心服务器
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何知道docker是否已经登录到docker注册中心服务器EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何知道docker是否已经登录到docker注册中心服务器
EN