Last modified: 22 Nov 2021


Installing CIAO 4.15.2 Using the ciao-install Script

CIAO 4.15 Science Threads



The ciao-install script is designed to simplify and automate the installation and upgrade of CIAO and the Chandra Calibration DataBase (CALDB). ciao-install downloads the selected files to your computer, verifies them via md5sum, and unpacks them. The script configures CIAO, sets up the command-line ahelp system, and (optionally) runs the CIAO smoke tests.

The ciao-install help file has detailed information on the script. For a summary of options, run the script with the "--help" option.

Related Links:

Last Update: 22 Nov 2021 - Updated for CIAO 4.14.


Quick Start: Running ciao-install

Just looking for a reminder on how to run the ciao-install script? Here is it:

unix% bash /<path>/ciao-install

or, as described further below,

unix% bash /<path>/ciao-install --help

For a detailed description of running the script, read the rest of this thread.

System Requirements

CIAO is supported on a number of operating systems, which are listed on the Platform Support page. Certain system requirements are necessary to successfully install and run CIAO; review these system requirements before continuing with the installation.

Installation Issues

Users should be aware of these installation items before installing CIAO 4.15.2. Additional problems which are seen less frequently are listed on the Installation & Smoke Tests bug page.

Remove old parameter files

With every new CIAO release, some parameter files have changed: new parameters may be added and occasionally old ones removed or renamed. Deleting or renaming the local parameter directory ensures that the correct parameter files will be accessed the first time a tool is run:

unix% rm ~/cxcds_param4/*

Download the ciao-install script

download the ciao-install script.


Note: If you download multiple copies of ciao-install it is likely that your browser will append a number onto the file name, eg "ciao-install(1)". Be sure to check that you are using the last/correct version of this file.

Where should CIAO and CALDB be installed?

The CIAO software package and the Chandra Calibration Database (CALDB) can be installed in any location and do not need to be installed with root or super-user privileges.


CIAO unpacks into a directory called ciao-<version>/, i.e. ciao-4.15 for this release. If the current version of CIAO were to be installed into /usr/local/, the full path to CIAO would be /usr/local/ciao-4.15/. This directory (/usr/local/ciao-4.15/) is referred to as the root directory of CIAO in the rest of this thread. It is also the value that the $ASCDS_INSTALL environment variable is set to once CIAO has been started.

In the rest of this thread we will assume CIAO is being installed into the /soft/ directory.


CALDB may be installed in two ways:

  • within the CIAO installation, in the directory $ASCDS_INSTALL/CALDB
  • in a separate directory, in which case $ASCDS_INSTALL/CALDB will be a soft link to the actual CALDB location.

This thread shows both installation methods.

Users can also now automatically copy or link to an existing CALDB installation. For example if users are upgrading from the previous version of CIAO which has a full copy of the CALDB, then this may then allow ciao-install to download just the much smaller CALDB patch file needed to update that existing CALDB. An example of this is shown below.

Installing CIAO as the root user

It is is strongly suggested that CIAO be installed as a non-privileged, regular user and not as the root user. If CIAO must be installed in a directory owned by root and you are following the manual process, then

  1. create the ciao-4.15/ directory in the desired location, as the root user;
  2. use the chown utility to change ownership of this directory to the installer's username;
  3. unpack CIAO into the newly-created directory as the installer, not as the root user.

Installing the CIAO Software

In this example, the CALDB will be installed as a subdirectory of CIAO. If you want your CALDB to be in a different location, refer to "How to install the CALDB in an independent directory".

ciao-install may be run from any location. It prompts for required information. Here are the prompts and sample answers for a user named "ciaouser"; each prompt is explained in the following section:

unix% bash /<path>/ciao-install
ciao-install v1.32 installing ciao-4.15
Requested packages: sherpa tools prism obsvis contrib CALDB_main
Script log file is /home/ciaouser/ciao-install-22-11-
Download directory for tar files (/home/ciaouser): /soft/download
CIAO installation directory (/home/ciaouser): /soft
Run smoke tests? (y|n) (y): 
Delete tar files after install? (y|n) (n):
Save these settings? (y|n) (y): 
Preparing to install CIAO for Linux 64 bit

Note that tab completion may be used at these prompts.

1. Requested packages

After printing the script version number, ciao-install lists the packages that were requested for this installation:

sherpa tools obsvis contrib CALDB_main

This example is installing the standard installation: CIAO tools, Sherpa, the CALDB (except for the blank-sky files), and the science scripts.

2. The installation log

The log file - ciao-install-<date>.log - records the script status information; this is also printed to the screen. The log file can be used to help diagnose problems via the CXC Helpdesk.

3. Download directory for tar files

The download directory is a location to which the software and CALDB tarfiles are downloaded before the software is installed. For this installation the directory name is /soft/download/:

Download directory for tar files (/home/ciaouser): /soft/download

4. CIAO installation directory

The next prompt is for the location of CIAO; we want CIAO to be installed into /soft/ciao-4.15 so we answer /soft rather than accept the default value:

CIAO installation directory (/home/ciaouser): /soft

5. Run smoke tests?

The next prompt asks you whether to run the CIAO smoke tests; these are some simple tests we provide to help validate the installation. Is is strongly suggested that you accept the default value of y here:

Run smoke tests? (y|n) (y): 

6. Delete tar files after install?

Should the tarfiles be deleted when ciao-install is down running? The default value is n:

Delete tar files after install? (y|n) (n):

The tarfiles can also be removed manually later.

7. Save these settings?

The final prompt is to ask you whether the default answers for the prompts should be updated to use your current selection. If you answer "yes" (y), then the values will be written to the text file ~/.ciaoinstall.rc and will be used the next time the tool is run. In this case we accept the default value:

Save these settings? (y|n) (y): 

8. Which build will be installed

After the prompts, the script prints out a line indicating which CIAO build will be installed:

Preparing to install CIAO for Linux with Python 3.7

At this point, the script begins to download the software tarfiles and install them (e.g. gunzip and untar them). The name, filesize, and download location of each file is printed to the screen:

Downloading file ciao-control (1 Kb) to /soft
Downloading file ciao-ciao-4.15-bin-core-Linux.tar.gz (193 Mb) to /soft
Verifying file /soft/ciao-4.15-bin-core-Linux.tar.gz
Installing file /soft/ciao-4.15-bin-core-Linux.tar.gz in /soft
Downloading file ciao-4.15-bin-obsvis-Linux.tar.gz (1 Mb) to /soft
Verifying file /soft/ciao-4.15-bin-obsvis-Linux.tar.gz
Installing file /soft/ciao-4.15-bin-obsvis-Linux.tar.gz in /soft
Downloading file ciao-4.15-bin-sherpa-Linux.tar.gz (1 Gb) to /soft
Verifying file /soft/ciao-4.15-bin-sherpa-Linux.tar.gz
Installing file /soft/ciao-4.15-bin-sherpa-Linux.tar.gz in /soft
Downloading file ciao-4.15-bin-tools-Linux.tar.gz (87 Mb) to /soft
Verifying file /soft/ciao-4.15-bin-tools-Linux.tar.gz
Installing file /soft/ciao-4.15-bin-tools-Linux.tar.gz in /soft
Downloading file ciao-4.15-contrib-3.tar.gz (2 Mb) to /soft
Verifying file /soft/ciao-4.15-contrib-3.tar.gz
Installing file /soft/ciao-4.15-contrib-3.tar.gz in /soft

The files sizes will be different for different platforms.

After the files are downloaded and unpacked, the script configures CIAO and reindexes the CIAO help files ("ahelp"):

running chcon to allow CIAO to work with SELinux
Running configure ./configure
Re-indexing ahelp system
Creating binary compiled python modules

The 'running chcon' line only appears on Linux installations. It indicates that the installation has been updated to run under Security-Enhanced Linux, if is installed on your system.

The script will then run the smoke tests. Since the smoke tests include tests of a number of the GUI applications in CIAO, windows will appear and disappear during these tests. This can make using your computer difficult, since these windows may take the mouse focus or overlap your working windows.

The screen output provides a count of how many tests have been run:

Running smoke tests
 Requested test suite includes 40 tests
   [1/40] Running test ahelp-smoke001 ... PASS
   [2/40] Running test ipython-smoke001 ... PASS
   [3/40] Running test ipython-smoke002 ... PASS

This will continue until all the tests have finished, at which point you should see

   [38/40] Running test tools-dmstat-smoke001 ... PASS
   [39/40] Running test tools-dmstat-smoke002 ... PASS
   [40/40] Running test tools-dmstat-smoke003 ... PASS
 40 smoke tests run: 40 PASSED, 0 FAILED, 0 SKIPPED
Processing complete!
Script Log file is /home/ciaouser/ciao-install-22-11-

Verifying test successes

A successful test is logged with a "... PASS", while an unsuccessful test reports:

   [7/40] Running test <testname> ... FAIL
         Review /tmp/smoke.username/<testname>/diff.log for details

The smoke tests print a summary of successful and failed tests. If all tests were successful:

All smoke tests completed:  PASS 
Smoke tests complete. All tests passed!

or if any failed:

 1 out of 40 smoke tests FAILED.

 Please check
 for a list of known issues before contacting the Help Desk.


The script finished by printing the installation location.

CIAO 4.15.2 installed in /soft/ciao-4.15

Known Smoke Test Issues

There is a bug page for known installation and smoke test issues. If you experience a problem that isn't listed there, submit it to CXC Helpdesk.

You can now proceed to the creating a CIAO alias step.

How to Install the CALDB in an Independent Directory

The destination directory for the CALDB must exist before running ciao-install. In this example, we want to install the CALDB into /soft/CALDB. The directory is created, then --caldb switch is used to set this location in ciao-install.

unix% mkdir /soft/CALDB
unix% bash /<path>/ciao-install --caldb /soft/CALDB
ciao-install v1.32 installing ciao-4.15
Requested packages: sherpa tools obsvis contrib CALDB_main
Script log file is /home/ciaouser/ciao-install-22-11-
Download directory for tar files (/home/ciaouser): /soft/download
CIAO installation directory (/usr): /soft
Run smoke tests? (y|n) (y): 
Delete tar files after install? (y|n) (n):
Save these settings? (y|n) (y): 

ciao-install is run one time: it installs the CIAO software in /soft, installs the CALDB in /soft/CALDB, and links CIAO to the CALDB directory. It then runs the smoke tests, as described in detail in the "Installing the Software: CALDB within CIAO" section.

Using ciao-install to patch CALDB in an independent directory

ciao-install can also be used to apply patches to CIAO, the CALDB, and the contributed software scripts.

Copy existing CALDB files from previous CIAO installation

Users can now choose to automatically copy the CALDB files from an existing CIAO directory into the current version. This may allow ciao-install to then download just the much smaller CALDB patch file.

unix% bash /path/ciao-install --copy-caldb /soft/common/CALDB
ciao-install v1.32 installing ciao-4.15
Requested packages: sherpa tools obsvis contrib CALDB_main
Script log file is /home/ciaouser/ciao-install-22-11-
Download directory for tar files (/soft): 
CIAO installation directory (/soft): 
Run smoke tests? (y|n) (y): 
Delete tar files after install? (y|n) (n): 
Preparing to install CIAO for Linux 64 bit
Downloading file ciao-control (1 Kb) to /soft
Copying CALDB from /soft/common/CALDB to /soft/ciao-4.15
Installing file /soft/ciao-4.15-bin-tools-Linux.tar.gz in /soft
CALDB patch download required.
Downloading file caldb_4.10.7_upgrade.tar.gz (607 Mb) to /soft
Verifying file /soft/caldb_4.10.7_upgrade.tar.gz
Installing file /soft/caldb_4.10.7_upgrade.tar.gz in ciao-4.8/CALDB

To save disk space, some users may wish to simply create a link to the existing CALDB directory. This can be done using the --link-caldb option. Note: users should be careful when using links since any patches/upgrades will be visible to all the versions of CIAO that link to that location and removing the old CIAO installation will break the current version.

Create a CIAO alias

It is strongly suggested that you create an alias to make it easy to set up and use CIAO.

The alias syntax depends on the shell (tcsh, csh, bash); see this FAQ for help in determining which shell you are using.

  • csh/tcsh users should add the following to their $HOME/.cshrc file.
    alias ciao "source /soft/ciao-4.15/bin/ciao.csh"
  • bash users should add the following to their $HOME/.bashrc file.
    alias ciao="source /soft/ciao-4.15/bin/"
  • ksh users should add the following to their $HOME/.login file.
    alias ciao="source /soft/ciao-4.15/bin/"

Users can create the file if one does not already exist. These are simply text files that can be edited with the users favorite text editor (emacs, vi, gedit, etc.).

More information is given in the Running CIAO section of the Starting CIAO thread.

Once the alias is defined, you will be able to simply type

unix% ciao

and CIAO will be setup and ready to use in that window.

Check the CALDB installation

The scripts package contains the check_ciao_caldb tool which performs a simple test of the Chandra CALDB installation. Users must have selected the default full CIAO installation or have selected the Scripts Package for this utility to be installed.

After starting CIAO, running the tool should produce screen output like the following:

unix% ls -1F /soft/ciao-4.15/CALDB/
unix% check_ciao_caldb
 CALDB environment variable = /soft/ciao-4.15/CALDB
             CALDB version = 4.10.7
             release date  = 2023-09-14T16:00:00 UTC
CALDB query completed successfully.

If CALDB is installed in a different location, the check_ciao_caldb output will include the line:

CALDB environment variable = /soft/ciao-4.15/CALDB
        which is a link to = /soft/CALDB/

For a more-thorough validation please follow the chkcif steps described on the download CALDB page.

Additional options

The ciao-install script has several other additional options. Use --help to review them.

unix% bash /path/ciao-install --help
ciao-install v1.32

Usage: /path/ciao-install [options...]

  -h --help Print this message
  --download-only Download only Do not install
  --install-only  Install only Do not download
  --download <dir> Download directory
  --prefix <dir> Install directory
  --logdir <dir> Log file directory
  --config <--with-top=dir> Extra configure switches
  --caldb <dir> Location of the CALDB
  --copy-caldb <dir> Location of to copy into ciao
  --link-caldb <dir> Location of to link into ciao
  --system <system> System to install
           (Linux, macOSX)
  --batch Batch mode (no prompts)
  --silent Silent mode (implies batch) No tty output
  --delete-tar Delete tar files after install.
  --add <segment> Add additional segment to CIAO.
  --remove <segment> Force this segment to not install in CIAO.
  -f --force Force re-install
  -v --version Report version and exit

Clean Up

Finally, you may delete the tarfiles from the original download directory. For this example we would say:

unix% cd /soft/download
unix% rm ciao-4.15*gz
unix% rm caldb_4.10.7_main.tar.gz 

You may also delete the log file(s) - e.g. ciao-install-<date>.log - once you have reviewed them for errors.


Known Conflicts

There are some known conflicts between CIAO and other software or system libraries and tools. They are documented in the following webpages:


The CIAO installation is now complete. For help getting started with the software, read the Introductory science threads.


20 Apr 2009 The CIAO 4.1.2 release coincides with the beta release of the ciao-install script.
16 Jun 2009 clarified why ciao-install must be run twice to install CALDB in a separate location
15 Dec 2009 updated for the CIAO 4.2 release: ciao-install is the recommended method for installing CIAO. Many enhancements have been made to the script: it now downloads and unpacks the tarfiles, installs the software, and runs the smoke tests.
29 Dec 2009 Added Installing on Snow Leopard note
16 Mar 2010 Added Downloading the CALDB: FTP passive mode note
05 Apr 2010 updated for CALDB 4.2.1: version number of CALDB main tarfile
19 Apr 2010 updated for CALDB 4.2.2: version number of CALDB main tarfile
27 Sep 2010 updated for CALDB 4.3.1: version number of CALDB main
15 Dec 2010 updated for the CIAO 4.3 and CALDB 4.4.1 releases: minor changes to screen output
15 Dec 2011 reviewed for the CIAO 4.4 and CALDB 4.4.7 releases: minor changes to screen output
13 Jun 2012 reviewed for the CIAO 4.4.1 and CALDB 4.4.10 releases: minor changes to screen output
03 Dec 2012 Review for CIAO 4.5
19 Nov 2013 Updated for CIAO 4.6. Cosmetic updates
09 May 2014 Re-order sections. Moved creating ciao alias before check caldb. Added note that check_caldb requires the contrib package to be installed.
11 Dec 2014 Updated for CIAO 4.7. Version updates and minor text edits.
29 Jun 2015 added additional information for passive FTP mode.
15 Dec 2015 Updated for CIAO 4.8. Added information about new CALDB flags.
09 Feb 2016 Updated for CIAO 4.8.1.
24 Feb 2016 Updated for CIAO 4.8.1/4.8.2.
27 May 2016 updated for CALDB 4.7.2: version number of CALDB main
04 May 2017 updated for CALDB 4.7.4.
20 Jul 2017 updated for CALDB and contrib 4.9.4.
18 Aug 2017 updated for CALDB 4.7.6.
13 Dec 2017 updated for CALDB 4.7.7.
09 Apr 2018 Updated for CIAO 4.10, CALDB 4.7.8.
11 Sep 2018 updated for CALDB 4.8.0.
25 Oct 2018 updated for CALDB 4.8.1.
03 Sep 2019 updated for CALDB 4.8.4.
11 Dec 2019 CIAO 4.12 updates.
03 Sep 2019 updated for CALDB 4.9.1 and contrib 4.12.2.
15 Oct 2020 updated for CALDB 4.9.3 and contrib 4.12.4.
16 Dec 2020 updated for CIAO 4.13, contrib 4.13.0, caldb 4.9.4
29 Apr 2021 updated for CALDB 4.9.5 and contrib 4.13.1.
22 Nov 2021 Updated for CIAO 4.14.