Eleven vows (Ekadash vrat) were part of the ethical system prescribed by Mahatma Gandhi mainly for all those residing in the ashram.

Gandhi insisted on observance of these eleven vows in Ashram.

The vows
The eleven vows were: 
 Ahinsa (non-violence)
Satya (truth)
Asteya (Non-Stealing)
Brahmacharya (self-control)
Asangraha (renunciation of possession)
 Sharir shram (body labour)
 Asvada (control of the palate)
 Swadeshi (self-reliance)
Samanlok (equal respect for all religions)
Abaya (fearlessness on all occasions)
Asparsh (no untouchability)

Speech & book 
In 1915 Gandhi delivered an address to the students at Madras in which he discussed these vows. It was later published as 'THE NEED OF INDIA'.
He used to deliver a speech on the Ashram vows every Tuesday after prayers. These speeches were published as a book Mangal Prabhat in 1958.

See also 
 Practices and beliefs of Mahatma Gandhi

References 

Mahatma Gandhi