An octopus expels waste through a siphon located on the side of its mantle! The siphon is also responsible for shooting jets of water to propel itself forward, and dispersing ink clouds to protect against predators!
When a chromatophore is relaxed, the sac contracts and leaves an octopus looking white. When muscles around a chromatophore tighten, the sac is pulled open, showing color which can be black, brown, orange, red, or yellow (hello 70s vibes!).
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Unlike bone structures with rigid skeletal elements, the octopus can bend, twist, elongate, (and more) at MULTIPLE locations simultaneously. Their muscular hydrostat system allows them to perform complex motor activities all while remaining incredibly flexible.
How? Their optic nerve fibers route behind the retina and their rectangular pupils help octopuses see in all directions in addition to giving them control over how much light they let into their eyes.
Their rectangular pupils also allow them to see color! While octopuses are technically colorblind, their dumbbell-shaped pupils act like prisms, scattering white light and splitting it into its color components.
This effect is called chromatic aberration which their wide pupils help to accentuate. When octopuses change the depth of their eyeball, they can focus different wavelengths of light on the retina individually.
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The cephadm shell command launches a bash shell in a containerwith all of the Ceph packages installed. By default, ifconfiguration and keyring files are found in /etc/ceph on thehost, they are passed into the container environment so that theshell is fully functional. Note that when executed on a MON host,cephadm shell will infer the config from the MON containerinstead of using the default configuration. If --mount is given, then the host (file or directory) will appearunder /mnt inside the container:
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