Member since
02-21-2019
69
Posts
44
Kudos Received
11
Solutions
My Accepted Solutions
| Title | Views | Posted |
|---|---|---|
| 931 | 06-06-2018 02:51 PM | |
| 3013 | 10-12-2017 02:48 PM | |
| 883 | 08-01-2017 08:58 PM | |
| 23477 | 06-12-2017 02:36 PM | |
| 3139 | 02-16-2017 04:58 PM |
01-08-2019
11:35 PM
<namenode> is the issue
... View more
06-06-2018
02:51 PM
1 Kudo
Hi @Thiago
Charchar, you can use the HBase REST service that comes by default in the package, you only have to start it - the init script is located under /usr/hdp/current/hbase-master/etc/rc.d/hbase-rest. These will be the endpoints offered: https://hbase.apache.org/1.1/apidocs/org/apache/hadoop/hbase/rest/package-summary.html You can start it on the HBase Master nodes (usually 2 of them) but if you'd need it to scale, I guess you can start it on as many nodes are required, it's just a Java app that offers the REST service and connects to HBase in the backend. You can also tune it a little bit, for example setting the number of threads (in Custom
hbase-site): hbase.rest.threads.max=200
hbase.rest.threads.min=10
... View more
02-08-2018
11:31 PM
5 Kudos
Introduction
OpenID Connect (OIDC) is an authentication layer on top of OAuth 2.0, an authorization framework.
It uses simple JSON Web Tokens (JWT), which is an open standard for securely transmitting information as a JSON object. These objects are normally signed with an RSA key and contain information such as if the user was authenticated or the user's id and email. More information and examples can be found here: https://auth0.com/docs/tokens/concepts/jwts
Knox, together with pac4j, a Java security engine, uses OpenID Connect (and also SAML, CAS, OAuth) to enable Single Sign On using a variety of 3rd party Identity Providers that support these protocols.
For example, Knox can be integrated with a service such as https://auth0.com to provide users authenticated to auth0 access to Hadoop resources (without a need to enter their credentials again or even integrate Knox with an LDAP).
Following is an example of how Knox can integrate with auth0 using OpenID Connect.
Setup auth0
Sign up
The first step is to sign up to https://auth0.com and create an account to manage the identity provider.
Since this a public SaaS based service, it needs a unique identifier to distinguish between clients (it will form its own unique subdomain):
Add the first user
Once the account is created, add a new user in the auth0 internal database. This user will be used to login in Knox. auth0 can integrate with a variety of sources (including AD/LDAP) and Social (Google, Facebook). However, for this test, we define the user in the default auth0 internal Database.
Go to Users section and create your first user:
Define the client
Once we have a new user, the next step is to define a new client, in this case Knox, which is a Regular Web Application:
Client id and secret
Once the application is created, go to the Settings tab and note down the information that Knox will use to authenticate itself, as a client application, to auth0 (these will later be used in Knox's configuration):
Callback URLs
Then there is one setting that needs defined here - Allowed Callback URLs - which is the Knox URL that auth0 will redirect the user back to after successful authentication. This URL is in the following format:
https://<KNOX>:8443/gateway/knoxsso/api/v1/websso?pac4jCallback=true&client_name=OidcClient
So for our example, we can use:
discoveryUri
Lastly, one other piece of configuration required by Knox is discoveryUri, which can be found at the end of the configuration page, in the Show Advanced Settings section -> Endpoints -> OpenID Configuration (typically in the format https://<IDP-FQDN>/.well-known/openid-configuration):
https://anghelknoxtest.eu.auth0.com/.well-known/openid-configuration
This process, creating an application, getting its ID and Secret, configuring the allowed callback URL and finding out the discoveryUri are steps for any OpenID Connect identity provider. These have also been tested with NetIQ for instance.
Knox Configuration
To enable any SSO type authentication in Knox (be it OpenID Connect, SAML or other pac4j IdP), the Knox default topology must be configured to use the SSOCookieProvider and then the knoxsso.xml topology must be configured to use the OpenID Connect provider.
default topology
Set the following in the default topology (Advanced topology in Ambari) so that it uses SSOCookieProvider. Replace any other authentication providers (by default it's the ShiroProvider) with the ones bellow and set the sso.authentication.provider.url to the correct Knox IP/FQDN):
<provider>
<role>webappsec</role>
<name>WebAppSec</name>
<enabled>true</enabled>
<param>
<name>cors.enabled</name>
<value>true</value>
</param>
</provider>
<provider>
<role>federation</role>
<name>SSOCookieProvider</name>
<enabled>true</enabled>
<param>
<name>sso.authentication.provider.url</name>
<value>https://00.000.000.000:8443/gateway/knoxsso/api/v1/websso</value>
</param>
</provider>
knoxsso topology
And then configure the pac4j provider for OpenID Connect in your knoxsso.xml topology (Advanced knoxsso-topology in Ambari) - as per documentation.
Set the following:
pac4j.callbackUrl should point to the Knox IP or FQDN in this format: https://<KNOX>:8443/gateway/knoxsso/api/v1/websso
clientName to OidcClient
oidc.id to the Client ID from the auth0 Client configuration
oidc.secret to the Client Secret from the auth0 Client configuration
oidc.discoveryUri to the oidc.discoveryUri from the auth0 Client configuration
oidc.preferredJwsAlgorithm to RS256
knoxsso.redirect.whitelist.regex should include the IP or FQDN of Knox.
The following is the full topology definition for knoxsso.xml with the example values from the previous points:
<topology>
<gateway>
<provider>
<role>webappsec</role>
<name>WebAppSec</name>
<enabled>true</enabled>
<param><name>xframe.options.enabled</name><value>true</value></param>
</provider>
<provider>
<role>federation</role>
<name>pac4j</name>
<enabled>true</enabled>
<param>
<name>pac4j.callbackUrl</name>
<value>https://00.000.000.000:8443/gateway/knoxsso/api/v1/websso</value>
</param>
<param>
<name>clientName</name>
<value>OidcClient</value>
</param>
<param>
<name>oidc.id</name>
<value>8CD7789Nyl5QZd0Owuyamb7E0Qi29F9t</value>
</param>
<param>
<name>oidc.secret</name>
<value>CSIR3VtIdEdhak6LWYgPEv69P4J0P7ZcMOVnQovMoAnZGVOtCjcEEWyPOQoUxRh_</value>
</param>
<param>
<name>oidc.discoveryUri</name>
<value>https://anghelknoxtest.eu.auth0.com/.well-known/openid-configuration</value>
</param>
<param>
<name>oidc.preferredJwsAlgorithm</name>
<value>RS256</value>
</param>
</provider>
</gateway>
<application>
<name>knoxauth</name>
</application>
<service>
<role>KNOXSSO</role>
<param>
<name>knoxsso.cookie.secure.only</name>
<value>false</value>
</param>
<param>
<name>knoxsso.token.ttl</name>
<value>3600000</value>
</param>
<param>
<name>knoxsso.redirect.whitelist.regex</name>
<value>^https?:\/\/(localhost|00\.000\.000\.000|127\.0\.0\.1|0:0:0:0:0:0:0:1|::1):[0-9].*$</value>
</param>
</service>
</topology>
Test
Now restart Knox and test if it works.
To test, go to any Knox page, like https://<KNOX>:8443/gateway/default/templeton/v1/status or https://<KNOX>:8443/gateway/default/webhdfs/v1/tmp
For example, going to https://00.000.000.000:8443/gateway/default/templeton/v1/status should redirect to the auth0 authentication page:
And once you input the user details for the user that was previously created, it should redirect back to the knox page that was originally requested:
The user id
There is one issue remaining, that of the user identifier that is being retrieved by Knox, which is then used to communicate with Hadoop services and Ranger.
If we look in the gateway-audit.log file, we can see the following entry for the above request:
WEBHCAT|auth0|5a79dd769bf9bc6ee2539f67|||access|uri|/gateway/default/templeton/v1/status|success|Response status: 200
From the log, we can see that the user Knox actually "sees" is auth0|5a79dd769bf9bc6ee2539f67 which is the user id from auth0:
This is not exactly useful if we want to apply Ranger policies for example, or if we care about the user that Knox proxies to Hadoop services.
To understand better, if we enable DEBUG logging in Knox, we would see the following entry after the user authenticates:
DEBUG filter.Pac4jIdentityAdapter (Pac4jIdentityAdapter.java:doFilter(70)) - User authenticated as: <OidcProfile> | id: auth0|5a79dd769bf9bc6ee2539f67 |attributes: {sub=auth0|5a79dd769bf9bc6ee2539f67, email_verified=true, updated_at=2018-02-08T12:47:56.061Z, nickname=aanghel, name=aanghel@hortonworks.com, picture=https://s.gravatar.com/avatar/7baaabe6020925809d0650e9d4cefe9c?s=480&r=pg&d=https%3A%2F%2Fcdn.auth0.com%2Favatars%2Faa.png, email=aanghel@hortonworks.com} | roles: [] | permissions: [] | isRemembered: false |
From the above, we can see that the OpenID Connect implementation in Knox uses a Profile which has an id and many attributes. To be able to use any of these attributes, Knox 0.14 is required or at least the KNOX-1119 patch, which adds a new configuration variable - pac4j.id_attribute, that allows us to pick the attribute that we want from the session above. We can define this configuration in the knoxsso topology, after pac4j.callbackUrl:
<param>
<name>pac4j.id_attribute</name>
<value>nickname</value>
</param>
With the above, a Knox 0.14 will use the actual username when communicating with Hadoop or Ranger.
... View more
Labels:
10-12-2017
04:07 PM
@balalaika ^^
... View more
10-12-2017
03:20 PM
1 Kudo
Glad it work, but I didn't say to use ls -l (which outputs the additional stuff), but ls -1 (as in the 1 - the number) which outputs only the filename, one per line.
... View more
10-12-2017
02:48 PM
1 Kudo
Hi @balalaika It would be better to just output the file listing with 1 filename per line and then have a SplitText processor, followed by a FetchFile. You can do this with the -1 parameter for ls: ls -1 /home/user/test | grep ".zip" SplitText will just generate 1 flowfile for each file which is then easily picked by FetchFile. You will still need to add an ExtractText between them but with a simple (.*) rule (this is to transfer the flowfile content - which is the actual filename - into an attribute that can be used by FetchFile as the filename).
... View more
10-11-2017
06:22 PM
1 Kudo
@Foivos A The output.stream relation from ExecuteStreamCommand contains the stdout from the command executed. Unless you do cat <unzipped_file> at the end of your script you won't see anything on that relation. And this would only work if you only have 1 unzipped file of course. The way I did this was to have the script "echo" at the end the names of the local files, one per line. This output will go to the output.stream relation and from there you can do SplitText to split the output by line followed by a FetchFile -> PutHDFS. If you're still interested, I can share my flow and the scripts, but as Abdelkrim mentioned, UnpackContent should do the job, even for very large files as UnpackContent followed by PutHDFS will be streamed so will not affect the NiFi heap.
... View more
09-29-2017
07:15 PM
Hi @Jacqualin jasmin You have to use the API or the configs.sh helper command: /var/lib/ambari-server/resources/scripts/configs.sh
-port 8080 set localhost <CLUSTER_NAME> ranger-env ranger_admin_log_dir
"/var/log/hdp/ranger/admin" /var/lib/ambari-server/resources/scripts/configs.sh
-port 8080 set localhost <CLUSTER_NAME> ranger-env ranger_usersync_log_dir
"/var/log/hdp/ranger/usersync" /var/lib/ambari-server/resources/scripts/configs.sh
-port 8080 set localhost <CLUSTER_NAME> ranger-env ranger.tagsync.logdir
"/var/log/hdp/ranger/tagsync"
... View more
08-01-2017
08:58 PM
1 Kudo
Hi @Gerd Koenig NiFi needs two configuration passwords, nifi.security.encrypt.configuration.password and nifi.sensitive.props.key. You can pass those using the nifi-ambari-config in the blueprint. The passwords also need to be at least 12 characters in length. Here's a simple blueprint that normally works for me: {
"configurations" : [
{
"nifi-ambari-config" : {
"nifi.node.ssl.port": "9091",
"nifi.node.port": "9090",
"nifi.security.encrypt.configuration.password": "AsdQwe123456",
"nifi.sensitive.props.key": "AsdQwe123456"
}
},
{
"nifi-env" : {
"nifi_group" : "nifi",
"nifi_user" : "nifi"
}
}
],
"host_groups" : [
{
"name" : "mytestcluster-singlenode",
"configurations" : [ ],
"components" : [
{ "name" : "ZOOKEEPER_CLIENT" },
{ "name" : "INFRA_SOLR_CLIENT" },
{ "name" : "ZOOKEEPER_SERVER" },
{ "name" : "NIFI_MASTER" },
{ "name" : "AMBARI_SERVER" },
{ "name" : "INFRA_SOLR" },
{ "name" : "METRICS_COLLECTOR" },
{ "name" : "METRICS_GRAFANA" },
{ "name" : "METRICS_MONITOR" }
]
}
],
"Blueprints" : {
"stack_name" : "HDF",
"stack_version" : "3.0"
}
}
Regarding the folders, yes, NiFi will recreate them based on the configuration variables. These can also be set in the blueprint: {
"nifi-ambari-config" : {
"nifi.internal.dir" : "/var/lib/nifi",
"nifi.content.repository.dir.default" : "/var/lib/nifi/content_repository",
"nifi.state.dir" : "{nifi_internal_dir}/state/local",
"nifi.flow.config.dir" : "{nifi_internal_dir}/conf",
"nifi.config.dir" : "{nifi_install_dir}/conf",
"nifi.flowfile.repository.dir" : "/var/lib/nifi/flowfile_repository",
"nifi.provenance.repository.dir.default" : "/var/lib/nifi/provenance_repository",
"nifi.database.dir" : "/var/lib/nifi/database_repository"
}
},
... View more
07-03-2017
07:32 AM
Hi @suresh krish this is now fixed in Ambari 2.5.1: https://issues.apache.org/jira/browse/AMBARI-20868
... View more