EC2 instance creation fails with “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet”

For the second time I ran into this same issue. When using RunInstancesCommand from the AWS SDK for Javascript, a certain parameter combination results in a misleading and confusing error message: “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet” There is no parameter “groupName” in my request. The problem was that the… Continue reading EC2 instance creation fails with “InvalidParameterCombination: The parameter groupName cannot be used with the parameter subnet”

Finnish public holidays

There are a number of public holidays in Finland, many of which are paid vacation days for most people. Some of these holidays are observed on a certain weekday near a calendar date, such as Good Friday, Easter Monday, Ascension Day(Thursday), and Midsummer’s Eve(Friday). Other observed Christian holidays are always observed on the weekend, so… Continue reading Finnish public holidays