KernelCare.ePortal is a web management console for KernelCare for servers located behind the firewall, with no internet access. It is part of KernelCare Enterprise offering, and should be installed on premisses

ePortal Hardware Requirements

ePortal machine disk size doesn't change with the number of connected servers.

Requirements are always the same:

  • 100 GB minimum
  • 200 GB recommended
  • SSD


SSD is the crucial requirement.

As far as other requirements concerned, we have tested the following configuration and the following number of connected servers:

  • 10k of connected machines is the maximum for the following requirements:
    • VM
    • 1 VCPU
    • 1 GB RAM
  • 75k of connected machines is the maximum for the following requirements:
    • Core i5
    • 1 CPU
    • 4 GB RAM


KernelCare.ePortal on EL6

To install KernelCare.ePortal, start with the minimal image of EL6

For installation and workability of e-portal nginx web server is required. We recommend to use a stable version from the official nginx repository:

$ cat > /etc/yum.repos.d/nginx.repo <<EOL
name=nginx repo

Please find more information at

Setup KernelCare.ePortal repo:

$ cat > /etc/yum.repos.d/kcare-eportal.repo <<EOL

Install KernelCare.eportal:

$ yum install kcare-eportal

KernelCare.ePortal on EL7

To install KernelCare.ePortal, start with the minimal image of EL7

For installation and workability of e-portal nginx web server is required. We recommend to use stable version from the official nginx repository:

$ cat > /etc/yum.repos.d/nginx.repo <<EOL
name=nginx repo

Please find more information at

Setup KernelCare.ePortal repo:

$ cat > /etc/yum.repos.d/kcare-eportal.repo <<EOL
name=KernelCare ePortal

Install KernelCare.eportal:

$ yum install kcare-eportal

How to adjust proxy on ePortal machine

On ePortal machine, you should define the same proxy settings as you use in the command line.

You need this file: /etc/uwsgi/emperor.ini

Its content looks like:

uid = nginx
gid = nginx
emperor = /etc/uwsgi/vassals

Add two more lines:

env = http_proxy=your_proxy_here
env = https_proxy=your_proxy_here


It is important to set both http_proxy and https_proxy.

Managing Users

You can manage portal using /usr/bin/kc.eportal utility:

-l --list-users list all users
-a --add-user add a user
-d --delete-user delete a user
-c --change-password change a user password
-p --password provide a password for a user
-h --help show this help

To add a user:

$ kc.eportal -a admin -p AdminPassword

To change user's password:

$ kc.eportal -c admin -p NewPassword

LDAP authorization

It is possible to support a secure connection. To do so, specify the right format of connection string as a key to enter user login.

For example:



This key is a must in a connection string and should include %s

You are also able to specify security settings and set-up timeouts using LDAP URL.

Accessing ePortal

To access KernelCare.eportal management console, connect to: http://YOUR_IP/admin

And enter your login & password

You can manage your login information using kc.eportal tool.

PatchSet Deployment


ePortal v0.8+

KernelCare.ePortal has built-in mechanism to download latest patches. To start using it, click Patch Source link in KernelCare.ePortal navigational bar and then click Settings. Your patch source access info will be provided by your KernelCare representative.

Once you set up patch source access info, you will get to a list of available patchsets. You can always go back & change your access info by clicking Source link.

Clicking on [changelog] will provide changelog for given patchset. Clicking on [deploy this patch, and all before it] will download and deploy this patchset and all the patchsets above. It is impossible to deploy patchsets out of order.

Managing Keys

To register new servers you need to create a KernelCare key that will be used for server registration. To go to the list of keys, click the KernelCare ePortal logo at the top left.

  • To edit a key, click . The Edit tab opens.
  • To remove a key, click . Please note, that removing the key would remove all servers under that key.
  • Click a key to go to Servers tab with the list of servers registered under that key. You can also remove servers on that tab.

To create a new registration click Create tab. Fill in the following fields:

  • Key —  you can provide a key name or leave the field empty, so an automatically generated name will be used
  • Description — you can provide a description for the key
  • Server Limit — the amount of servers that can be registered under that key
  • Feed — select a specific feed or leave empty.

Click Save to add the key. The new registration key will be created and added to the list. The key itself will be used as a part of the registration command on an individual server.

Click Save and Add Another to save this key and add one more key.

Click Save and Continue Editing to add the key and open the key edit tab.

Click Cancel to return to the key list tab without adding a new key.

Managing Servers

You can see servers belonging to the key by clicking on the key itself in Managing Keys interface.

The screen shows servers registered under the key, their IP, hostname, effective kernel as well as the time of registration and last check in.

Managing Script


If scripts do not work on your ePortal, you might need to update ePortal first. To update ePortal, please run the following command:

> yum update kcare-eportal

To view the list of all servers IDs that are connected to the particular key, do the following:

  • In the UI go to the page with the list of keys. Then click the particular key. The list of servers connected to this key will be displayed.

To view the list of all servers IDs that are not connected to any key, do the following:

  • In the UI go to the page with the list of keys. Then click Reset filters button.
  • OR just follow this URL http://EPORTAL_IP/admin/kcserver/.

Script to unroll patchsets

To unroll patchset, run:

> kc.eportal --unroll 16012017_1

Script to determine the number of servers under the management of ePortal, per key

To see pairs of key/number of servers run:

> kc.eportal --list-servers
Count Key
0 2shcolu7Y1x6885Q
2 6J89aS44j6OmTr05

Script to automatically install latest patchsets

It determines if latest patches are available and installs them.

>kc.eportal --get-latest

Unroll patches from UI

In the patch-source page, there is a list of available patches. To unroll patches click the button Roll back this patch, and all after it. Use it to roll back the patch and all the following patches.

Show extended check-in statistics in admin UI

A new table is added to the starting page. This table displays the following:

  • Total number of servers.
  • Number of servers that checked in for the past 48 hours.

The number of servers for each key is listed in the Key Inventory table.

Ability to create read-only users

[root@localhost ~]# kc.eportal -l
Num | Username
--- + --------------------------------
 1 | admin
 2 | user
[root@localhost ~]# kc.eportal -r user
User 'user' is now readonly

Feed Management

Feeds are intended to manage patchsets on the server, and they provide a possibility to bind a set of patches to a specific key. Possible use cases: for preliminary testing of patches, for applying updates to groups of servers with the similar hardware, etc.

To get into Feeds Management interface go to Settings → Feeds:

On this page a user can manage the existing feeds: create, delete, edit.

Available options:

  • Name — a name of a feed.
  • Auto update — enable and disable automatic downloading of patches to this feed.
  • Deploy after X hours — a delay in hours between the moment the patchset is available for deployment and the moment it is installed to the feed.

Every 10 minutes ePortal checks for new patches on the main patch server. If a new patch is available, it is uploaded to the ePortal server. Note: it is uploaded but is not deployed. The patch availability time is considered starting from the moment a new patch appears on the ePortal, and that time is taken into account in Deploy after X hours option. So, if a user sets Deploy after X hours = 10, the patch will be deployed to the feed 10 hours after it has been downloaded to the ePortal server.

To make the feed auto-update immediately (so that, new patches are loaded to the feed immediately after they are available on ePortal), set Deploy after X hours = 0.

A special case is a clean installation when ePortal is installed on a new server (there aren't any downloaded archives with patches and feeds with deployed patchsets, including default feed). In this case, if a user creates a new feed and sets Deployed after X hours option right away, then all patches (from the oldest to the latest available) will be deployed to the feed after the specified X hours. This is because the archives are downloaded from scratch and will be considered as “just appeared on ePortal” — that is, all patches will have the same appearance time on ePortal from which the option Deploy after X hours will repel.

On the main ePortal page, a user can set the corresponding key <> feed pair. This is done in the key creation interface or when editing a key.

By default, a new key is bound to the default feed, alternatively, a user can choose a desired feed from the drop-down menu.


When removing a feed all keys attached to this feed will be moved to the default feed.

Adding extra Tag field

To add an extra Tag field for the server, run:

kcarectl --tag command

where command is a parameter defined by a user. This parameter will be displayed in UI for the server. User could add multiple tags for each server. Each tag should be separated with ; symbol.


kcarectl --tag “env:prod;ubuntu”

This server has two tags : env:prod and ubuntu.

env:prod is a parameter that has tag name env and the value prod.

To remove all tags from a particular server, run:

kcarectl --tag ""

Where "" is a parameter to delete the previously defined tag.

How to setup ePortal to use HTTPS

Some assumptions for a server where e-portal is deployed:

  1. A firewall is disabled for 443 port.
  2. Private and public keys are downloaded on the server.
  • Edit ssl configuration template according to your certificates:
mv /etc/nginx/eportal.ssl.conf.example /etc/nginx/eportal.ssl.conf
vi /etc/nginx/eportal.ssl.conf
  • Include this configuration into the main one:
sed -e '3iinclude eportal.ssl.conf;' -i /etc/nginx/conf.d/eportal.conf
  • Restart nginx:
service nginx restart

In order to communicate with e-portal, updated to https, you need to modify KernelCare config files on all the servers if they have IPs hardcoded servers settings.

To do that, update PATCH_SERVER and REGISTRATION_URL environment variables:

vi /etc/sysconfig/kcare/kcare.conf

So, after editing your /etc/sysconfig/kcare/kcare.conf should contain updated PATCH_SERVER and REGISTRATION_URL environment variables like in the example below:


The following example demonstrates how to connect new servers to e-portal configured for https:

$ export KCARE_PATCH_SERVER=https://eportal_domain_name/
$ export KCARE_REGISTRATION_URL=https://eportal_domain_name/admin/api/kcare
$ export
$ curl -s | bash
$ /usr/bin/kcarectl --register key_from_your_eportal

Deploying KernelCare

To deploy kernelcare client software to use ePortal, following enviornment variables should be setup prior to RPM install:

Environment Variable Value Description
KCARE_PATCH_SERVER http://eportal_ip/ URL to a server from which patches will be downloaded
KCARE_REGISTRATION_URL http://eportal_ip/admin/api/kcare URL to ePortal's api
KCARE_MAILTO [2.5+] email@address Email to receive all notifications related to failed KernelCare updates. Used in /etc/cron.d/kcare-cron


$ export
$ curl -s | bash
$ kcarectl --register r72fF838Q47oWigj

KernelCare client config file

KernelCare client configuration file is located in /etc/sysconfig/kcare/kcare.conf



If AUTO_UPDATE set to True, KernelCare client will check in every 4 hours, and try to download and apply latest patches

PATCH_SERVER - server from which patches will be downloaded

REGISTRATION_URL - URL used to register/unregister server

Changing ePortal IP

You can change ePortal IP at any moment, but you need to modify KernelCare config files on all the servers if they have IPs hardcoded.

To do that, edit: /etc/sysconfig/kcare/kcare.conf



To point to the right location.

Configuration & locations

Web Server (nginx) configuration is located at /etc/nginx/conf.d/eportal.conf

Database (sqlite) is stored in /usr/share/kcare-eportal/data.sqlite To reset database:

$ rm /usr/share/kcare-eportal/data.sqlite
$ cd /usr/share/kcare-eportal && python

Client access data file used to decide if server has access to the patches is stored in /usr/share/kcare-eportal/kcare_servers.htpasswd

Patches are stored in: /usr/share/kcare-eportal/patches

Stopping & Starting

KernelCare.ePortal on EL6

To stop/start/reload/restart configuration of nginx server:

$ /etc/init.d/nginx stop|start|reload|restart

To stop/start/restart ePortal (Python):

$ /etc/init.d/uwsgi stop|start|restart

KernelCare.ePortal on EL7

To stop/start/reload/restart configuration of nginx server:

$ systemctl stop|start|reload|restart nginx

To stop/start/restart ePortal (Python):

$ systemctl stop|start|restart emperor.uwsgi

Log Files

ePortal messages/errors: /var/log/uwsgi/uwsgi-emperor.log

nginx ePortal access log: /var/log/nginx/kcare-eportal.log

nginx error log: /var/log/nginx/error_log

ePortal API


version 0.9+

KernelCare.ePortal provides limited API to remove servers based on key & IP.

To access the API, first setup API token used for authentication:

echo your_token > /usr/share/kcare-eportal/config/api.token

API method: unregister_by_key.plain


  • key - KernelCare.ePortal key under which server is registered;
  • IP - remote server IP as displayed in KernelCare.ePortal;
  • token - API token.



Return code: int

  • -3 - API token file does not exist;
  • -2 - API token doesn't match;
  • -1 - Internal error, see /var/log/uwsgi/uwsgi-emperor.log for details;
  • any other number - number of servers removed.

Nagios & Zabbix support

KernelCare.ePortal since version 1.2 supports server monitoring similar to Nagios & Zabbix monitoring.

You can curl the API directly to receive the information:


or you can use script by modifying KEY_KCARE_NAGIOS_ENDPOINT in it to point to your server (change (link to old UI) or (link to new UI) with https://yourserver/admin ).


Access using PARTNER_LOGIN/TOKEN is not supported by KernelCare.ePortal.