Detecting co-resident services in a container cloud

A computer program product, comprising:

• one or more computer readable storage devices and program instructions stored on the one or more computer readable storage devices, the stored program instructions comprising:
• program instructions to receive a bit string over a side channel within a trial period of time, wherein the side channel includes a first resource on the first host that is accessible by cloud containers located on the first host, and wherein the bit string is received by monitoring the first resource for activity indicative of bit values;
• program instructions to determine whether a key corresponding to the bit string matches a pre-determined key corresponding to a second program in a second cloud container;
• and
• program instructions to determine whether the second cloud container is located on the first host based, at least in part, on whether the key corresponding to the bit string matches the pre-determined key.

A computer system, comprising:

• one or more computer processors;
• one or more computer readable storage devices;
• program instructions stored on the one or more computer readable storage devices for execution by at least one of the one or more computer processors, the stored program instructions comprising:
• program instructions to receive a bit string over a side channel within a trial period of time, wherein the side channel includes a first resource on the first host that is accessible by cloud containers located on the first host, and wherein the bit string is received by monitoring the first resource for activity indicative of bit values;
• program instructions to determine whether a key corresponding to the bit string matches a pre-determined key corresponding to a second program in a second cloud container;
• and
• program instructions to determine whether the second cloud container is located on the first host based, at least in part, on whether the key corresponding to the bit string matches the pre-determined key.