Docker on Linux in Azure

You can configure automatic log upload for continuous reports in Cloud App Security using a Docker on Ubuntu, Red Hat Enterprise Linux (RHEL), or CentOS in Azure.


  • OS:

    • Ubuntu 14.04, 16.04, and 18.04
    • RHEL 7.2 or higher
    • CentOS 7.2 or higher
  • Disk space: 250 GB

  • CPU: 2

  • RAM: 4 GB

  • Set your firewall as described in Network requirements


If you have an existing log collector and want to remove it before deploying it again, or if you simply want to remove it, run the following commands:

docker stop <collector_name>
docker rm <collector_name>

Log collector performance

The Log collector can successfully handle log capacity of up to 50 GB per hour comprised of up to 10 data sources. The main bottlenecks in the log collection process are:

  • Network bandwidth - Your network bandwidth determines the log upload speed.

  • I/O performance of the virtual machine - Determines the speed at which logs are written to the log collector's disk. The log collector has a built-in safety mechanism that monitors the rate at which logs arrive and compares it to the upload rate. In cases of congestion, the log collector starts to drop log files. If your setup typically exceeds 50 GB per hour, we recommend that you split the traffic between multiple log collectors.


If you require more than 10 data sources, we recommend that you split the data sources between multiple log collectors.

Set up and configuration

  1. Go to the Automatic log upload settings page.

    1. In the Cloud App Security portal, click the settings icon followed by Log collectors.

    settings icon

  2. For each firewall or proxy from which you want to upload logs, create a matching data source.

    1. Click Add data source.
      Add a data source
    2. Name your proxy or firewall.
      Name for proxy or firewall
    3. Select the appliance from the Source list. If you select Custom log format to work with a network appliance that isn't listed, see Working with the custom log parser for configuration instructions.
    4. Compare your log with the sample of the expected log format. If your log file format doesn't match this sample, you should add your data source as Other.
    5. Set the Receiver type to either FTP, FTPS, Syslog – UDP, or Syslog – TCP, or Syslog – TLS.


    Integrating with secure transfer protocols (FTPS and Syslog – TLS) often requires additional settings or your firewall/proxy.

    f. Repeat this process for each firewall and proxy whose logs can be used to detect traffic on your network. It's recommended to set up a dedicated data source per network device to enable you to:

    • Monitor the status of each device separately, for investigation purposes.
    • Explore Shadow IT Discovery per device, if each device is used by a different user segment.
  3. Go to the Log collectors tab at the top.

    1. Click Add log collector.
    2. Give the log collector a name.
    3. Enter the Host IP address of the machine you'll use to deploy the Docker. The host IP address can be replaced with the machine name, if there is a DNS server (or equivalent) that will resolve the host name.
    4. Select all Data sources that you want to connect to the collector, and click Update to save the configuration.
      Select data sources
  4. Further deployment information will appear. Copy the run command from the dialog. You can use the copy to clipboard icon. copy to clipboard icon

  5. Export the expected data source configuration. This configuration describes how you should set the log export in your appliances.

    Create log collector


    • A single Log collector can handle multiple data sources.
    • Copy the contents of the screen because you will need the information when you configure the Log Collector to communicate with Cloud App Security. If you selected Syslog, this information will include information about which port the Syslog listener is listening on.
    • For users sending log data via FTP for the first time, we recommend changing the password for the FTP user. For more information, see Changing the FTP password.

Step 2 – Deployment of your machine in Azure


The following steps describe the deployment in Ubuntu. The deployment steps for other platforms are slightly different.

  1. Create a new Ubuntu machine in your Azure environment.

  2. After the machine is up, open the ports by:

    1. In the machine view, go to Networking select the relevant interface by double-clicking on it.
    2. Go to Network security group and select the relevant network security group.
    3. Go to Inbound security rules and click Add, Add inbound security rules
    4. Add the following rules (in Advanced mode):
    Name Destination port ranges Protocol Source Destination
    caslogcollector_ftp 21 TCP <Your appliance's IP address's subnet> Any
    caslogcollector_ftp_passive 20000-20099 TCP <Your appliance's IP address's subnet> Any
    caslogcollector_syslogs_tcp 601-700 TCP <Your appliance's IP address's subnet> Any
    caslogcollector_syslogs_udp 514-600 UDP <Your appliance's IP address's subnet> Any

    Ubuntu Azure rules

  3. Go back to the machine and click Connect to open a terminal on the machine.

  4. Change to root privileges using sudo -i.

  5. If you accept the software license terms, uninstall old versions and install Docker CE by running the commands appropriate for your environment:

  1. Remove old versions of Docker: yum erase docker docker-engine

  2. Install Docker engine prerequisites: yum install -y yum-utils

  3. Add Docker repository:

    yum-config-manager --add-repo
    yum makecache
  4. Install Docker engine: yum -y install docker-ce

  5. Start Docker

    systemctl start docker
    systemctl enable docker
  6. Test Docker installation: docker run hello-world

  1. In the Cloud App Security portal in the Create new log collector window, copy the command to import the collector configuration on the hosting machine:

    Copy command to import collector configuration on hosting machine

  2. Run the command to deploy the log collector.

    (echo db3a7c73eb7e91a0db53566c50bab7ed3a755607d90bb348c875825a7d1b2fce) | docker run --name MyLogCollector -p 21:21 -p 20000-20099:20000-20099 -e "PUBLICIP=''" -e "PROXY=" -e "" -e "COLLECTOR=MyLogCollector" --security-opt apparmor:unconfined --cap-add=SYS_ADMIN --restart unless-stopped -a stdin -i starter

    Ubuntu proxy

  3. To verify that the log collector is running properly, run the following command: Docker logs <collector_name>. You should get the results: Finished successfully!

    Command to verify log collector is running properly

Step 3 - On-premises configuration of your network appliances

Configure your network firewalls and proxies to periodically export logs to the dedicated Syslog port of the FTP directory according to the directions in the dialog. For example:

BlueCoat_HQ - Destination path: \<<machine_name>>\BlueCoat_HQ\

Step 4 - Verify the successful deployment in the Cloud App Security portal

Check the collector status in the Log collector table and make sure the status is Connected. If it's Created, it's possible the log collector connection and parsing haven't completed.

Check the collector status in the Log collector

You can also go to the Governance log and verify that logs are being periodically uploaded to the portal.

Alternatively, you can check the log collector status from within the docker container using the following commands:

  1. Log in to the container by using this command: docker exec -it <Container Name> bash
  2. Verify the log collector status using this command: collector_status -p

If you have problems during deployment, see Troubleshooting Cloud Discovery.

Optional - Create custom continuous reports

Verify that the logs are being uploaded to Cloud App Security and that reports are generated. After verification, create custom reports. You can create custom discovery reports based on Azure Active Directory user groups. For example, if you want to see the cloud use of your marketing department, import the marketing group using the import user group feature. Then create a custom report for this group. You can also customize a report based on IP address tag or IP address ranges.

  1. In the Cloud App Security portal, under the Settings cog, select Cloud Discovery settings, and then select Continuous reports.

  2. Click the Create report button and fill in the fields.

  3. Under the Filters you can filter the data by data source, by imported user group, or by IP address tags and ranges.

    Custom continuous report

Next steps

If you run into any problems, we're here to help. To get assistance or support for your product issue, please open a support ticket.