Golang Warsaw #56 Jakub Wołynko Secure access to EC2 (for developers) Agenda – introduction – EC2 in native environment – 3-tier architecture intro – alternative methods of resource connection: equivalent 3-tier architecture3-tier architecture - props and cons – full control over resource access – possibilities of disconnection resources from the internet – in general, more secure unfortunately – architecture getting more complex – additional costs like VPN, NatGateway – regular resource access become more annoying solution one - bastion host Host Instance ProxyJump Bastion PreferredAuthentications

The dangers of abusing multiple dispatch (aka, more on types with values-as-parameters)430 34.13 Access arrays in memory order, along columns . . . . . . . . . . . . . . . . . . . . 431 34.14 Pre-allocating . . . . . . . . . . . . . . . . . . . . . . 451 36.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 451 36.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can

The dangers of abusing multiple dispatch (aka, more on types with values-as-parameters)430 34.13 Access arrays in memory order, along columns . . . . . . . . . . . . . . . . . . . . 431 34.14 Pre-allocating . . . . . . . . . . . . . . . . . . . . . . 451 36.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 451 36.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can

The dangers of abusing multiple dispatch (aka, more on types with values-as-parameters)459 35.13 Access arrays in memory order, along columns . . . . . . . . . . . . . . . . . . . . 460CONTENTS vii 35 . . . . . . . . . . . . . . . . . . . . . . 484 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 484 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can

The dangers of abusing multiple dispatch (aka, more on types with values-as-parameters)459 35.13 Access arrays in memory order, along columns . . . . . . . . . . . . . . . . . . . . 460CONTENTS vii 35 . . . . . . . . . . . . . . . . . . . . . . 484 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 484 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can

The dangers of abusing multiple dispatch (aka, more on types with values-as-parameters)459 35.13 Access arrays in memory order, along columns . . . . . . . . . . . . . . . . . . . . 460CONTENTS vii 35 . . . . . . . . . . . . . . . . . . . . . . 484 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 484 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can

. . . . . . . . . . . . . . . . . . . . . . 496 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 496 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can character indices: julia> collect(eachindex(s)) 7-element Vector{Int64}: 1 4 5 6 7 10 11 To access the raw code units (bytes for UTF-8) of the encoding, you can use the codeunit(s,i) function, where

. . . . . . . . . . . . . . . . . . . . . . 495 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 495 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can character indices: julia> collect(eachindex(s)) 7-element Vector{Int64}: 1 4 5 6 7 10 11 To access the raw code units (bytes for UTF-8) of the encoding, you can use the codeunit(s,i) function, where

. . . . . . . . . . . . . . . . . . . . . . 495 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 495 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can character indices: julia> collect(eachindex(s)) 7-element Vector{Int64}: 1 4 5 6 7 10 11 To access the raw code units (bytes for UTF-8) of the encoding, you can use the codeunit(s,i) function, where

. . . . . . . . . . . . . . . . . . . . . . 495 37.8 Prefer exported methods over direct field access . . . . . . . . . . . . . . . . . . . 495 37.9 Use naming conventions consistent with Julia base/ julia> str[begin-1] ERROR: BoundsError: attempt to access 14-codeunit String at index [0] [...] julia> str[end+1] ERROR: BoundsError: attempt to access 14-codeunit String at index [15] [...] You can character indices: julia> collect(eachindex(s)) 7-element Vector{Int64}: 1 4 5 6 7 10 11 To access the raw code units (bytes for UTF-8) of the encoding, you can use the codeunit(s,i) function, where